OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Cigarette smoking. Young woman exhales smoke from a cigarette. Nicotine in tobacco causes addiction to cigarettes; tar in tobacco produces chronic irritation of the respiratory system and is thought to cause lung cancer. Tobacco smoking is a major health hazard, and only by abstaining from it can the dangers be avoided. Cigarette smoking is associated with such diseases as chronic bronchitis, coronary heart disease and lung cancer.
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