This document discusses the harms of smoking tobacco. It defines smoking and tobacco, and notes that tobacco kills half of its users, causing 30% of cancer deaths and 17% of heart disease deaths. The document then discusses reasons why teens start smoking, including peer pressure and marketing tactics. It outlines some health consequences of smoking like respiratory diseases, heart disease, cancer, and staining of teeth. Finally, it provides tips for quitting smoking and reasons to quit like living longer and saving money.