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The main ingredient in cigarettes is tobacco. Tobacco is a green, leafy plant that is grown in warm climates. Farmers use many chemicals to grow tobacco. They use fertilizers to make the soil rich and insecticides to kill the insects that eat the tobacco plant.
From Wikipedia, the free encyclopedia. Commercial tobacco smoke is a mixture of more than 5000 chemicals. According to the U.S. Department of Health and Human Services, the following are known human carcinogens found in cigarette smoke: 1  List of additives in cigarettes.  Health effects of tobacco smoking.