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 Vaping cancer risk: The backlash that erupted after Australian study Travel warning: E cigarettes are illegal in Thailand Disposable vapes contain 'more toxic metals than 19 cigarette packs' Evidence update on the cancer risk of vaping e cigarettes: A systematic review Vaping Is Likely To Cause Cancer, Major New Aussie Study Finds: 'Only A Matter Of Time'