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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.
Cigarette smoke contains carbon monoxide. When inhaled, carbon monoxide in cigarettes reduces the ability of red blood cells to carry oxygen to tissues in the body and brain. As carbon monoxide levels in the blood increase, oxygen levels in the blood decrease.