This document discusses the dangers of tobacco and substance use for teenagers. It notes that teenage drinking can negatively impact brain development. Tobacco use is the leading cause of preventable death and while smoking rates have declined, many still smoke. E-cigarettes contain nicotine and other chemicals, and studies have found carcinogens in secondhand e-cigarette emissions. The bottom line is that e-cigarettes are a tobacco product and their long term health impacts are still unknown, so proven methods of quitting smoking like those discussed at Lung.org are recommended.