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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.
It is the nicotine, not the smoke, that causes people to continue to smoke cigarettes, but it is the cigarette smoke that causes many of the problems. Cigarette smoke is a combination of lethal gasesâcarbon monoxide, hydrogen cyanide, and nitrogen and sulfur oxidesâand tars, which contain an estimated 4,000 chemicals.