Tobacco is a plant whose leaves are used in products like cigarettes, cigars, and chewing tobacco. The primary active ingredient in tobacco is nicotine, a highly addictive substance. Nicotine affects the brain's reward system, making it difficult for users to quit. However, nicotine is not the only harmful component. Tobacco smoke contains over 7,000 chemicals, including carcinogens like benzene and formaldehyde, which are known to cause cancer.
