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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.
Whatâs in a cigarette, 599 ingredients in a cigarette. Nicotine in small doses acts as a stimulant to the brain. In large doses, itâs a depressant, inhibiting the flow of signals between nerve cells. In even larger doses, itâs a lethal poison, affecting the heart, blood vessels, and hormones.