More cancer patients are vaping UPI.com Can vaping cause cancer? The evidence suggests it might. The Washington Post Vape Juice Ingredients: What's Inside Your E Liquid? VITAE Glass Since their introduction in Europe in 2006 and the U.S. in 2007, the use of e cigarettes a.k.a., vapes has skyrocketed. A recent review from researchers in Australia found the results Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link