Lung cancer risks persist with e cigarette use after quitting tobacco smoking 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. Public Health Consequences of E Cigarettes Vapes '95% safer' than cigarettes messaging backfired Does vaping (using e cigarettes) make a difference to our health and are there harms with second hand vaping? iHealth Facts What Does Vaping Do to Your Brain? University of Nevada, Reno