Users often appear successful and well adjusted. High doses of caffeine may cause nausea, diarrhea, sleeplessness, headache, heart palpitations, trembling, and nervousness. Misuse of tablets can cause convulsions, breathing failure, and death. Individuals with livers damaged by use of alcohol can accumulate un-metabolized caffeine to toxic levels.
Coffee is a source of cadmium, a toxic heavy metal related to heart disease.
Sugar in foods as well as added to coffee can temporarily remove fatigue, mild depression, and cravings to drink, but it aggravates blood-sugar problems, and withdrawal can cause depression, mental confusion, irritability, and strong cravings to drink or use. For the rest of the day, the smoker tries to maintain this feeling with as many as 800 hits in two packs of cigarettes, spending up to 4 hours to smoke them, something that no other drug addict can match for frequency. Studies have shown nicotine to be more addictive than heroin, alcohol, or cocaine. Nicotine Tolerance develops and withdrawal symptoms of headache, agitation, irritability, diarrhea and depression can last up to 6 weeks. Every cigarette shortens your life by 14 minutes, not only from the carcinogenic tars, but also the carbon monoxide which deprives the heart of oxygen at the same time the nicotine is stimulating it to work harder.