What Does Vaping Do to Your Brain? University of Nevada, Reno Stop Smoking E Cigarettes CardioSmart American College of Cardiology The Health Impacts of E Cigarettes Frontiers Direct health implications of e cigarette use: a systematic scoping review with evidence assessment 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.