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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.
1, 4. Cigarettes have an average nicotine content of about 8.4 milligrams. Many brands of cigars contain at least 10 to 20 times that amount and some can contain 50 times the amount of nicotine as cigarettes. 3. When cigar and cigarette smokers inhale, the nicotine is absorbed rapidly.