Smoking is a practice in which a substance, most commonly tobacco , is burned and the smoke is tasted or inhaled. The most common method of smoking today is through cigarettes, primarily industrially manufactured but also hand-rolled from loose tobacco and rolling paper. Tobacco-related diseases are some of the biggest killers in the world today and are cited as one of the biggest causes of premature death in industrialized countries. Tobacco-related diseases are some of the biggest killers in the world today and are cited as one of the biggest causes of premature death in industrialized countries. Most tobacco smokers begin during adolescence or early adulthood. Smoking has elements of risk-taking and rebellion, which often appeal to young people. The presence of high-status models and peers may also encourage smoking. Because teenagers are influenced more by their peers than by adults,attempts by parents, schools, and health professionals at preventing people from trying cigarettes are often unsuccessful.