JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Cigarette smoking. View of a hand holding a smoking cigarette. The tobacco used to make cigarettes contains nicotine, which acts as a nerve stimulant but also causes addiction. Tar in the tobacco smoke will, over a period of time, stain the skin of the smoker's hand. It also produces chronic irritation of the respiratory system and causes lung cancer. Tobacco smoking has been linked to an increased risk of suffering from a variety of diseases, including lung cancer, chronic bronchitis and coronary heart disease.
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