Smoking cigarettes can negatively impact health in several ways. A cigarette is a roll of tobacco wrapped in paper that contains over 4000 chemicals, including 60 carcinogens. While some take up smoking to feel cool or reduce stress, it can increase risks of cancer, heart disease, and other illnesses. Smoking also harms appearance and athletic performance. The history of smoking dates back thousands of years and was commonly used in religious and social rituals. Today, tobacco production contributes to deforestation and global warming while cigarettes take decades to decompose after disposal.