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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.
We've listed information on a few compounds found in tobacco and cigarette smoke. Note that the most abundant ones, tar, nicotine and carbon monoxide are at the bottom of this list: 1  Acetaldehyde-this chemical is used in resins and glues. 2  It is believed to be a carcinogen.e've listed information on a few compounds found in tobacco and cigarette smoke. Note that the most abundant ones, tar, nicotine and carbon monoxide are at the bottom of this list: 1  Acetaldehyde-this chemical is used in resins and glues. 2  It is believed to be a carcinogen.