MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Cigarette smoking. Man holding a lit cigarette. Tobacco contains a range of harmful chemicals, including nicotine. It takes 20 seconds for nicotine to reach the brain and it is considered by some to be as addictive as heroin and cocaine. Tobacco contains tar, one of many carcinogens found in tobacco. It produces the chronic irritation of the respiratory system that can lead to lung cancer. Tobacco smoking is also associated with chronic bronchitis and coronary heart disease.
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