Cigarette smoking is the major cause of lung cancer.
Ninety percent of people with lung cancer smoked 20 cigarettes or more a day for 20 years. One study reported that smokers in their forties have aged and wrinkled skin comparable to nonsmokers who were 20 years older. A mixture of chemicals that foster the development of lung, mouth, throat and bladder cancers. The younger you start smoking and the more cigarettes you smoke, the more likely you are to develop one of these cancers. The chemical that addicts you to smoking.