Alerting to the Dangers of E Cigarettes : Johns Hopkins Center for Innovative Medicine 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. The Dangers of Vaping: Six Facts to Know Holland Hospital Le E liquide Madeleine Pistache Par La Bonne Vape ! YouTube