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. Vaping and E Cigarettes ADAPP Cabin Safety Electronic Cigarette Society of Certified Senior Advisors: E cigarettes: A Safe Alternative to Smoking? Lubbock health professionals question long term effects, safety of e cigarettes For e cigarettes, public supports health warnings & ban on sales to minors National Poll on Children's Health