Vaping has become common, but it's important to know what you're inhaling. Many e cigarettes contain nicotine, heavy metals like nickel and lead, and chemicals that can harm your lungs and overall health. Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association Circulation Health Effects Vaping Information, Solutions & Interventions Toolkit Stanford Medicine e Cigarettes, Vaping and the Risks of Severe Lung Disease Canyonlands Healthcare