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. E cigarette flavors are toxic to white blood cells, warn scientists E Cigarettes: Good Idea? Bad Idea? BU Today Boston University Vaping Forward South Bronx Coalition Print and Download About Vaping Prevention Resources HHS.gov Health effects and known pathology associated with the use of E cigarettes ScienceDirect