Abstract:
The filter using technology for reducing the smell of tobacco smoke on hands, according to one embodiment of the present invention, comprises: a filter unit for filtering tobacco smoke, the filter unit being coupled to a tobacco shred; and filter-wrapping paper for wrapping the filter unit. The filter unit or the filter-wrapping paper may contain a material for reducing the smell of tobacco smoke. According to the embodiment of the present invention, green tea extracts containing catechin or other materials for reducing the smell of tobacco smoke, e.g. citric acids, glycerols, tannic acids and the like can be added to a tobacco filter to remove the smell from tobacco smoke generated during smoking, thus significantly lowering the strength of the smell of tobacco smoke on the hands of a smoker as compared to conventional tobacco filters.

Description:
TECHNICAL FIELD 
     The present invention relates to a filter using a technology for reducing a cigarette smoke smell on hands, and a cigarette, and more particularly to a filter using a technology for reducing a cigarette smoke smell on hands which adds a cigarette smoke smell removing material to a cigarette filter to remove a smell from cigarette smoke caused during smoking and to thus significantly lower intensity of a cigarette smoke smell lingering on a hand of a smoker, and a cigarette. 
     BACKGROUND OF THE INVENTION 
     It is generally known that cigarette smoke caused from smoking includes harmful substances to the human body, such as tar or nicotine. Therefore, removing materials included in the smoke which damage to the human body is crucial, and a filter is attached to a cigarette accordingly. 
     Cigarette smoke may linger on fingers of a smoker holding a cigarette filter, causing displeasure due to the smell to not only the smoker but people around the smoker. Thus, the smoker often washes the hands to remove the cigarette smoke smell lingering on the hands after smoking. 
     However, the smoker may be in a situation of not being able to wash the hands after smoking or it may bother the smoker to wash the hands whenever smoking. 
     Accordingly, there is a need to develop a cigarette whose smell minimally lingers on the hands after smoking. 
     SUMMARY OF THE INVENTION 
     Technical Problems 
     An aspect of the present invention is to provide a filter using a technology for reducing a cigarette smoke smell on hands which adds a green tea extract containing catechin and citric acid, glycerol or tannic acid to a cigarette filter to remove a smell from cigarette smoke caused during smoking and to thus significantly lower intensity of a cigarette smoke smell lingering on a hand of a smoker as compared to conventional tobacco filters, and a cigarette. 
     Technical Solutions 
     According to an aspect of the present invention, there is provided a filter using a technology for reducing smell of cigarette smoke on hands, the filter including a filter unit coupled to a tobacco shred of a cigarette to filter cigarette smoke; and a filter wrapping paper to wrap the filter unit, wherein the filter unit or filter wrapping paper includes a cigarette smoke smell removing material for reducing smell of cigarette smoke, and accordingly a smell from cigarette smoke caused during smoking may be reduced, thus significantly lowering intensity of the smell of cigarette smoke lingering on the hands as compared to conventional tobacco filters 
     The cigarette smoke smell removing material may include any one or a mixture of catechin, citric acid, glycerol, tannic acid or β-cyclodextrin, scoria, titanium dioxide (TiO2), zeolite, zeolite-X, tourmaline, a  Houttuynia cordata  extract, a  Paeonia japonica  extract and flavonoid. 
     The cigarette smoke smell removing material may include at least one or a mixture of catechin, citric acid, glycerol, tannic acid and β-cyclodextrin. 
     The cigarette smoke smell removing material included in the filter unit or filter wrapping paper may include 2 to 25% of catechin. 
     The cigarette smoke smell removing material may include 15 to 20% of catechin. 
     The cigarette smoke smell removing material may be included in the filter unit or filter wrapping paper via coating or dipping, or be mixed with a liquid to be sprayed onto the filter unit or filter wrapping paper. 
     The filter unit or filter wrapping paper may include a green tea extract including catechin as a main component; and at least one of citric acid, glycerol and tannic acid. 
     The green tea extract may be extracted via a first process of mixing green tea leaves, PG at a preset weight ratio to the green tea leaves and alcohol and heating a mixture at a preset temperature for a predetermined time, and then a second process of additionally mixing with alcohol and heating for a preset time. The extract obtained via the first and second processes is concentrated to a final viscosity of 60 to 80 Brix 
     The citric acid or glycerol may be present in an amount of 1 to 20% in the filter unit or filter wrapping paper. 
     The filter may further include a tipping paper to cover an outside of the filter wrapping paper and to include the cigarette smoke smell removing material. 
     According to another aspect of the present invention, there is provided a method of manufacturing a cigarette filter including a filter unit coupled to a tobacco shred of a cigarette to filter cigarette smoke and a filter wrapping paper coupled to the filter unit, wherein a green tea extract including catechin as a main component is added to the filter unit or the filter wrapping paper, and a cigarette smoke smell removing material for reducing a cigarette smoke smell is further added to the filter unit or the filter wrapping paper including the green tea extract. As such, a green tea extract containing catechin and other cigarette smoke smell removing materials, such as citric acid, glycerol or tannic acid, are added to a cigarette filter to remove a smell from cigarette smoke caused during smoking, thus significantly lowering the intensity of the smell of cigarette smoke lingering on the hands of a smoker as compared to conventional tobacco filters. 
     The cigarette smoke smell removing material may include any one or a mixture of citric acid, glycerol, tannic acid and β-cyclodextrin. 
     The filter unit or the filter wrapping paper may be manufactured to include the green tea extract containing 5 to 25% catechin as a main component and be soaked in a solution including at least one of 5 to 60% citric acid and glycerol. 
     According to still another aspect of the present invention, there is provided a cigarette including a tobacco shred; a cigarette filter connected to the tobacco shred; and a tipping paper to cover the cigarette filter and part of the tobacco shred coupled to the cigarette filter, wherein the cigarette filter includes a filter unit to filter smoke of the cigarette and a filter wrapping paper to wrap the filter unit. 
     The filter unit or filter wrapping paper may include a cigarette smoke smell removing material for reducing smell of the cigarette. 
     The cigarette smoke smell removing material may be present inside the tipping paper, and the cigarette smoke smell removing material may include at least one of catechin, citric acid, glycerol, tannic acid and β-cyclodextrin. 
     The filter unit or the filter wrapping paper may be manufactured to include the green tea extract containing 5 to 25% catechin as a main component and be soaked in a solution including at least one of 5 to 60% citric acid and glycerol. 
     Advantageous Effects 
     According to one embodiment of the present invention, a green tea extract containing catechin and other cigarette smoke smell removing materials, such as citric acid, glycerol or tannic acid, are added to a cigarette filter to remove a smell from cigarette smoke caused during smoking 
     According to one embodiment of the present invention, a green tea extract containing catechin and citric acid, glycerol or tannic acid are added to a cigarette filter to remove a smell from cigarette smoke caused during smoking, thus significantly lowering the intensity of the smell of cigarette smoke lingering on the hands of a smoker as compared to conventional tobacco filters. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram schematically illustrating a configuration of a cigarette filter according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a configuration and an application according to one exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following description is one of different aspects of the present invention and is part of the detailed description of the present invention. 
     In describing the present invention, the detailed description of a known function or configuration will be omitted herein in order to clarify the gist of the present invention. 
       FIG. 1  is a diagram schematically illustrating a configuration of a cigarette filter according to an embodiment of the present invention. 
     The cigarette filter  110  according to the embodiment is a component forming a cigarette along with a tobacco shred (not shown) and includes, as shown in  FIG. 1 , a filter unit  120  coupled to the tobacco shred to filter cigarette smoke and a filter wrapping paper  130  to wrap the filter unit  120 . 
     Here, the filter unit  120  may include a first filter member  121  coupled to the tobacco shred and including activated carbon and a second filter member  125  disposed to be coupled to the first filter member  121  and including cellulose acetate. The first filter member  121  and the second filter member  125  are wrapped in separate filter wrapping papers  130 , and the filter unit  120  is entirely wrapped in a tipping paper  150 . 
     Here, the first filter member  121 , the second filter member  125 , the filter wrapping papers  130 , or the tipping paper  150  may include a cigarette smoke smell removing material for reducing a cigarette smoke smell, and thus a smell caused by side-stream (or mainstream) smoke of the cigarette smoke may less linger on a hand of a smoker after smoking. 
     In the present embodiment, the tipping paper  150  completely wraps the cigarette filter  110  and covers even part of the tobacco shred. Thus, the cigarette smoke smell removing material may be included in the tipping paper  150 . 
     The filter unit  120  is not limited to the foregoing configuration but may be also configured as a multiple filter, for example, a triple filter and a cavity filter. In addition, although the first filter member  121  includes activated carbon and the second filter member  125  includes cellulose acetate in the aforementioned description, the filter members are not limited to the foregoing materials and kinds. 
     Conventionally, in tobacco smoking, as mentioned above, a smell due to side-stream smoke lingers on a hand of a smoker to cause displeasure to the smoker and people around the smoker and the smoker has inconvenience of washing the hands after smoking. The present embodiment may resolve the foregoing problems by removing a cigarette smoke smell. 
     Referring to  FIG. 1 , the filter members  121  and  125 , particularly the second filter member  125  including acetate, the filter wrapping paper  130  wrapping the filter members  121  and  125 , and the tipping paper  150  may include the cigarette smoke smell removing material. 
     Here, the cigarette smoke smell removing material may be a green tea extract including catechin as a main component, citric acid, glycerol, tannic acid or β-cyclodextrin, or a mixture thereof. However, the cigarette smoke smell removing material may not be limited to these materials. 
     The cigarette smoke smell removing material, for example, a green tea extract including catechin as a main component, citric acid and glycerol, may be included in the filter wrapping paper  130  wrapping the filter members or in the tipping paper  150  via coating or dipping, or be mixed with a liquid to be sprayed onto the filter wrapping paper  130  or the tipping paper  150 . Accordingly, a cigarette smoke smell may be reduced. 
     Also, the cigarette smoke smell removing material may be mixed with a liquid, such as water, to be spayed, for example, onto the second filter member  125  including acetate, so that the cigarette smoke smell removing material may be evenly distributed in the second filter member  125 . 
     When the cigarette smoke smell removing material is included in the configuration of the cigarette filter  110 , nicotine as a main factor of a cigarette smoke smell by side-stream smoke may be decreased by about 30%, pyridine by about 13%, and 3-ethyl pyridine by about 40%, thereby reducing a cigarette smoke smell, which will be described in detail. 
     Hereinafter, the configuration of the cigarette filter  110  according to the present embodiment and a method of manufacturing the same will be described with reference to tables listed below. 
     
       
         
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                   
                 Caused in total 
                 Caused by  
                   
               
               
                 Contributing 
                 (Side-stream smoke + 
                 side-stream 
                 Caused by 
               
               
                 factor 
                 perforations) 
                 smoke 
                 perforations 
               
               
                   
               
             
             
               
                 Nicotine (ng/pad) 
                 4,778 (100%) 
                 1,274 (27%) 
                 3,504 (73%) 
               
               
                 Pyridine (ng/pad) 
                   709 (100%) 
                   312 (44%) 
                   397 (56%) 
               
               
                   
               
             
          
         
       
     
     To test a cigarette smoke smell reducing effect of the cigarette filter according to the present embodiment, transferable components including nicotine, pyridine and 3-ethyl pyridine as major factors of a cigarette smoke smell by side-stream smoke are selected as indicators. As a result of investigating distributions of cigarette smoke smell factors on the hands by side-stream smoke and of cigarette smoke smell factors by perforations of the tipping paper, nicotine is generated about 73% in the perforations, and pyridine is produced 56% in the perforations, as illustrated in Table 1. That is, the result shows that a cigarette smoke smell lingers on the hands greater by the perforations of the tipping paper. 
     Here, to analyze a cigarette smoke smell lingering on the hands, the tipping paper of the cigarette is covered with a glass fiber pad, after which components collected in the glass fiber pad after burning the cigarette are analyzed using an analysis method using solid-phase microextraction (SPME) combined with gas chromatography-mass spectrometry (GC/MS), SPME-GC/MS. Accordingly, smoke amount and a component difference according to smoke capacity (each cigarette) may be identified, and even smoke amount and a component difference by cigarette kind may be identified. 
     Table 2 illustrates nicotine reduction rate according to cigarette smoke smell removing materials (deodorizing materials), based on which a cigarette smoke smell removing material may be selected. 
     
       
         
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Nicotine 
                   
                 Nicotine 
                   
                 Nicotine 
               
               
                 Deodorizing 
                 reductionrate  
                 Deodorizing 
                 reduction rate  
                 Deodorizing 
                 reduction rate 
               
               
                 material 
                 (%) 
                 material 
                 (%) 
                 material 
                 (%) 
               
               
                   
               
             
             
               
                 Catechin (50%) 
                 50 
                 TiO 2   
                 30 
                 
                   Houttuynia 
                 
                 8 
               
               
                   
                   
                   
                   
                 
                   cordata 
                 
                   
               
               
                   
                   
                   
                   
                 extract 
                   
               
               
                 Tannic acid 
                 49 
                 Zeolite 
                 24 
                 
                   Paeonia 
                 
                 4 
               
               
                   
                   
                   
                   
                 
                   japonica 
                 
                   
               
               
                   
                   
                   
                   
                 extract 
                   
               
               
                 β-cyclodextrin 
                 48 
                 Zeolite-X 
                 19 
                 Flavonoid 
                 1 
               
               
                 Scoria 
                 38 
                 Tourmaline 
                 14 
               
               
                   
               
             
          
         
       
     
     First, according a nicotine analysis method, 10 ml of a 0.1 mg/ml nicotine solution (in IPA, isopropanol with heptadecane) is mixed with 0.5 g of a deodorizing material in a 30-ml conical tube, followed by a centrifugal process after 5 minutes, after which a supernatant is subjected to gas chromatography (GC) to analyze nicotine concentration, and nicotine analysis results are listed in Table 2. 
     Table 2 shows that among a plurality of deodorizing materials, catechin, tannic acid and β-cyclodextrin are appropriate as a cigarette smoke smell removing material. 
     Table 3 illustrates nicotine reduction rate and collected nicotine content according to concentration of catechin having a relatively high nicotine reducing effect. 
     
       
         
               
               
               
             
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 Catechin 
                 Analysis of nicotine caused from tipping paper 
                 Nicotine content  
               
             
          
           
               
                 content 
                   
                 Nicotine reduction  
                 of smoke collected  
               
               
                 (%) 
                 Nicotine peak area 
                 rate (%) 
                 in pad (%) 
               
               
                   
               
             
          
           
               
                 0 
                 46,676,796 ± 
                  0 
                 7.1 
               
               
                   
                 10,123,846 
                   
                   
               
               
                 5 
                 29,795,231 ± 23,284 
                 36 ± 4 
                 3.7 
               
               
                 10 
                 33,123,996 ± 
                 29 ± 25 
                 3.6 
               
               
                   
                 11,745,404 
                   
                   
               
               
                 15 
                 15,603,072 ± 
                 66 ± 7 
                 2.4 
               
               
                   
                  3,277,661 
                   
                   
               
               
                 20 
                 14,269,073 ± 
                 69 
                 2.1 
               
               
                   
                  5,555,971 
                   
                   
               
               
                 25 
                 17,192,751 ± 
                 63 ± 17 
                 2.1 
               
               
                   
                  8,010,663 
                   
                   
               
               
                   
               
             
          
         
       
     
     Filter wrapping papers each including 0, 5, 10, 15, 20 and 25% of catechin are prepared, filter members are covered with the respective filter wrapping papers, and tipping papers wrapped around the filter wrapping papers are wrapped in glass fiber pads. After burning the cigarettes, nicotine content collected in the glass fiber pads are analyzed with SPME-GC/MS. As a result, as illustrated in Table 3, when catechin content is 20%, the nicotine reduction rate is highest, which means that nicotine content is lowest. 
     Here, although the nicotine reduction rate grows and nicotine content decreases with catechin content increasing in a catechin content range from 0 to 20%, the nicotine reduction rate decreases again when catechin content exceeds 20%. 
     Accordingly, it is verified that catechin selectively removes nicotine, wherein when a filter wrapping paper including 5 to 25%, preferably 20% of catechin, is used, a cigarette smoke smell lingering on the hands in tobacco smoking may be reduced. 
     Since catechin is contained in green tea in large quantities, a green tea extract may be used as a cigarette smoke smell removing material. A green tea extract may be extracted via a first process of mixing green tea leaves, 5% by weight of PG based on weight of green tea leaves and alcohol ten times as much and heating the mixture, for example, at 50° C. for a predetermined time, and then a second process of adding alcohol eight times as much and heating at 50° C. The extract obtained via the first and second processes is concentrated into 70 Brix to be used for experiments. Here, the green tea extract may contain 8% of catechin, but catechin content of the green tea extract is not limited thereto. 
     Table 4 illustrates a nicotine reduction in a cigarette filter containing the green tea extract. 
     
       
         
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                   
                 Green tea extract content in filter (%) 
                 Reduction 
               
             
          
           
               
                 Classification 
                 0 (control) 
                 10 (experiment) 
                 rate (%) 
               
               
                   
               
               
                 TPM (mg/cig.) 
                 40.99 ± 2.44 
                 40.16 ± 2.69 
                 — 
               
               
                 Nicotine (mg/cig.) 
                  0.96 ± 0.04 
                  0.81 ± 0.04 
                 15.7 
               
               
                   
               
             
          
         
       
     
     As shown above, a cigarette filter containing 10% of the green tea extract includes a lower nicotine content than a cigarette filter containing no green tea extract and has a reduction rate of 15.7%. 
     Table 5 illustrates amounts of a plurality of cigarette smoke smell removing materials added in a green tea extract containing filter and a non-green tea extract containing filter, and Table 6 illustrates analysis results of content of nicotine lingering on the hands when a cigarette smoke smell removing material is added to a green tea extract containing filter and a non-green tea extract containing filter. 
     
       
         
               
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 5 
               
             
             
               
                   
               
               
                   
                 Amount of added deodorizing material (mg/tip) 
               
             
          
           
               
                   
                 Green tea extract  
                 Non-green tea extract 
               
               
                 Classification 
                 containing filter 
                 containing filter 
               
               
                   
               
             
          
           
               
                 Control (no addition) 
                 0 
                 0 
               
               
                 Glycerol 
                 71.31 
                 110.88 
               
               
                 Citric acid 
                 53.10 
                 40.76 
               
               
                 Cyclodextrin 
                 1.38 
                 2.00 
               
               
                 Flavonoid 
                 0.05 
                 0.05 
               
               
                 Tannic acid 
                 34.14 
                 30.65 
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
               
             
               
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 6 
               
             
             
               
                   
                   
               
               
                   
                   
                 Analysis of content of nicotine  
               
               
                   
                 Deodorizing 
                 lingering on hands (ng/pad) 
               
             
          
           
               
                   
                 material 
                 Green tea extract  
                 Non-green tea extract 
               
               
                   
                 added to filter 
                 containing filter 
                 containing filter 
               
               
                   
                   
               
             
          
           
               
                   
                 +Control (+water) 
                 6,360 
                 9,953 
               
               
                   
                 +Citric acid 
                 4,003 
                 3,610 
               
               
                   
                 +Flavonoid 
                 9,795 
                 11,642 
               
               
                   
                 +Glycerol 
                 1,835 
                 1,651 
               
               
                   
                 +Tannic acid 
                 6,072 
                 3,495 
               
               
                   
                 +Cycrodextrin 
                 8,460 
                 10,308 
               
               
                   
                   
               
             
          
         
       
     
     Referring to Table 5, a green tea extract containing filter is prepared and is soaked in a solution including a cigarette smoke smell removing material (glycerol, citric acid, cyclodextrin, flavonoid and tannic acid) to produce a cigarette filter, in which each cigarette smoke smell removing material is added in amounts listed above in Table 5. 
     Subsequently, a tipping paper is wrapped in a glass fiber pad and nicotine content collected in the glass fiber pad is analyzed using SPME-GC/MS. As a result, as in Table 6, a cigarette using the green tea extract containing filter has a low transition of nicotine as compared with a cigarette using the non-green tea extract containing filter. In addition, as a result of analyzing synergy effects between the cigarette smoke smell removing materials (deodorizing components), when citric acid or glycerol is added, nicotine content lingering on the hands is remarkably reduced comparatively. 
     For reference, Table 7 illustrates results of verifying a nicotine removing effect from mainstream smoke. 
     
       
         
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 7 
               
             
             
               
                   
                   
               
               
                   
                 Comparison of content of general components 
               
               
                   
                 shifting to mainstream smoke 
               
             
          
           
               
                 Deodorizing 
                 Green tea extract 
                 Non-green tea extract 
               
               
                 material 
                 containing filter 
                 containing filter 
               
             
          
           
               
                 added to 
                   
                   
                   
                 T/N 
                   
                   
                 Nico- 
                 T/N 
               
               
                 filter 
                 TPM 
                 Tar 
                 Nicotine 
                 ratio 
                 TPM 
                 Tar 
                 tine 
                 ratio 
               
               
                   
               
               
                 +Control 
                 7.3 
                 6.0 
                 0.51 
                 11.7 
                 5.3 
                 4.4 
                 0.42 
                 10.6 
               
               
                 (+water) 
               
               
                 +Citric acid 
                 5.5 
                 4.5 
                 0.34 
                 13.4 
                 5.2 
                 4.3 
                 0.34 
                 12.7 
               
               
                 +Flavonoid 
                 7.0 
                 5.5 
                 0.49 
                 11.2 
                 5.7 
                 4.8 
                 0.41 
                 11.7 
               
               
                 +Glycerol 
                 5.8 
                 5.0 
                 0.36 
                 13.9 
                 5.4 
                 4.7 
                 0.35 
                 13.4 
               
               
                 +Tannic acid 
                 6.2 
                 5.3 
                 0.40 
                 13.1 
                 5.9 
                 5.0 
                 0.38 
                 13.0 
               
               
                 +Cycrodextrin 
                 6.5 
                 5.5 
                 0.47 
                 11.6 
                 5.8 
                 4.8 
                 0.43 
                 11.0 
               
               
                   
               
             
          
         
       
     
     As a result of analyzing TPM, tar and nicotine in mainstream smoke from cigarettes employing a green tea extract containing filter and a non-green tea extract containing filter, each of which includes a cigarette smoke smell removing material (deodorizing component), as in Table 7, a cigarette using the green tea extract containing filter has a low transition of nicotine per tar (T/N ratio) as compared with a cigarette employing the non-green tea extract containing filter. Also, as a result of analyzing synergy effects between the cigarette smoke smell removing materials (deodorizing components), when a filter containing citric acid, glycerol or tannic acid is used, nicotine content lingering on the hands is remarkably reduced comparatively. 
     Table 8 illustrates nicotine content lingering on the hands when a green tea extract containing filter and a non-green tea extract containing filter are soaked in a solution including a cigarette smoke smell removing material in different concentrations. 
     
       
         
               
               
             
               
               
               
             
           
               
                 TABLE 8 
               
             
             
               
                   
               
               
                   
                 Analysis of content of nicotine  
               
               
                 Deodorizing 
                 lingering on hands (ng/pad) 
               
             
          
           
               
                 material 
                 Green tea extract  
                 Non-green tea extract 
               
               
                 added to filter 
                 containing filter 
                 containing filter 
               
               
                   
               
               
                 Control (+water) 
                 6,560 
                 9,870 
               
               
                   +Glycerol 5% 
                 5,453 
                 8,546 
               
               
                   +Glycerol 10% 
                 4,795 
                 7,655 
               
               
                   +Glycerol 30% 
                 4,505 
                 7,546 
               
               
                   +Glycerol 60% 
                 4,464 
                 7,478 
               
               
                  +Citric acid 5% 
                 6,357 
                 8,756 
               
               
                 +Citric acid 10% 
                 5,005 
                 7,060 
               
               
                 +Citric acid 30% 
                 4,965 
                 6,965 
               
               
                 +Citric acid 60% 
                 4,864 
                 6,864 
               
               
                   
               
             
          
         
       
     
     A green tea extract containing filter and a non-green tea extract containing filter are soaked in solutions containing glycerol and citric acid in different concentrations as cigarette smoke smell removing materials (deodorizing components) that remarkably reduce nicotine, thereby producing cigarettes employing cigarette filters with glycerol or citric acid applied in different concentrations. Subsequently, a tipping paper of each produced cigarette is wrapped in a glass fiber pad and nicotine content collected in the glass fiber pad while burning the cigarette is analyzed using SPME-GC/MS. Results are shown in Table 8. 
     The analysis results show that when glycerol or citric acid is applied to the green tea extract containing filter and the non-green tea extract containing filter, nicotine content decreases with concentrations thereof increasing and is optimal in the concentrations of glycerol and citric acid of 10% considering a nicotine reducing effect and the concentrations of the cigarette smoke smell removing materials. 
     Table 9 illustrates nicotine content lingering on the hands in a cigarette sample employing a green tea extract containing filter and in a cigarette sample employing a green tea extract and glycerol containing filter. 
     
       
         
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE 9 
               
             
             
               
                   
                   
               
               
                   
                   
                 Analysis category 
                   
               
             
          
           
               
                   
                   
                 Tar from 
                 Nicotine 
                 Reduction  
               
               
                   
                 Cigarette 
                 mainstream smoke 
                 lingering on 
                 rate 
               
               
                   
                 sample 
                 (mg/cig) 
                 hands (ng/pad) 
                 (%) 
               
               
                   
                   
               
             
          
           
               
                   
                 Control 
                 1.5 
                 10,951 
                 — 
               
               
                   
                 Experiment  
                 1.6 
                 6,331 
                 43.2 
               
               
                   
                 (green tea) 
                   
                   
                   
               
               
                   
                 Experiment  
                 1.7 
                 5,366 
                 51.0 
               
               
                   
                 (green tea +  
                   
                   
                   
               
               
                   
                 glycerol) 
               
               
                   
                   
               
             
          
         
       
     
     As illustrated above, the cigarette sample employing the green tea extract containing filter has a cigarette smoke smell lingering on the hands reduced by 43.2% as compared with the control, while the cigarette sample employing the filter containing the cigarette smoke smell removing material, glycerol, has a cigarette smoke smell lingering on the hands reduced by 51.0% as compared with the control. That is, nicotine reduction rate is higher and thus a cigarette smoke smell lingering on the hands is reduced greater when a cigarette smoke smell removing material is added for a synergy effect than when only the green tea extract is added. 
     For reference, functionality evaluation may be carried out for determining whether a cigarette smoke smell reducing effect is exhibited. That is, after cigarettes employing a filter containing a green tea extract and a cigarette smoke smell removing material are manufactured, smokers smoke the cigarettes, wearing cotton gloves, and non-smokers evaluate intensity of a cigarette smoke smell using the gloves. As a result of an experiment of 18 non-smokers, 16 people judge that the intensity of the cigarette smoke smell is reduced. That is, as mentioned above, when a green tea extract and a cigarette smoke smell removing material are applied to a filter, a cigarette smoke smell lingering on the hands is actually reduced. 
     As described above, according to the embodiment of the present invention, a green tea extract containing catechin and other cigarette smoke smell removing materials, such as citric acid, glycerol or tannic acid, are added to a cigarette filter to remove a smell from cigarette smoke caused during smoking, thus significantly lowering the intensity of the smell of cigarette smoke lingering on the hands of a smoker as compared to conventional tobacco filters. 
     It will be apparent to those skilled in the art that the present invention is not limited to the aforementioned embodiment but may be changed and modified in various ways without departing from the idea and scope of the present invention. Thus, other modifications and alternative embodiments are construed as being within the appended claims.