BSIP, MENDIL / SCIENCE PHOTO LIBRARY BSIP, MENDIL / SCIENCE PHOTO LIBRARY
Adolescent smoking. A teenage boy offers his friend a cigarette. Tobacco contains a number of carcinogenic materials. It also contains nicotine, a chemical which causes users to become addicted. One of the major side effects of smoking is lung cancer. It can also lead to coronary heart disease. Many people start smoking in their teenage years, and once they start it becomes difficult to stop.
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