CONOR CAFFREY / SCIENCE PHOTO LIBRARY CONOR CAFFREY / SCIENCE PHOTO LIBRARY
Cigarette smoking. Side view of a woman taking a drag on a cigarette. Nicotine in tobacco causes addiction to cigarettes; tar in the tobacco produces chronic irritation of the respiratory system and causes lung cancer. Tobacco smoking is a major health hazard. Apart from lung cancer, it is associated with such diseases as chronic bronchitis and coronary heart disease.
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