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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.
How many milligrams of nicotine are in one cigarette? Nicotine is an addictive poisonous alkaloid C 5 H 4 NC 4 H 7 NCH 3  , derived from the tobacco plant. Nicotine is used as an  insecticide. Forty milligrams of nicotine has kâ¦illed an adult  (Merck Index).