A complete list of the reasons to avoid smoking and chewing tobacco is not necessary here, but for starters, how about lung cancer, lip cancer, throat cancer, respiratory problems, heart disease and bad breath .
Tobacco contains nicotine.
Nicotine is a drug. Therefore, when people smoke or chew tobacco, they are using a drug . The tobacco plant is called Nicotiana tabacum and is named after an early importer named Jean Nicot. In 1828, nicotine was isolated from the leaves of the tobacco plant. American cigarettes contain about 9 mg of nicotine, but since much of the nicotine is burned off, a smoker gets about 1 mg of nicotine in every cigarette.