Governments around the world must take decisive action to crack down on e cigarettes and ban flavored vapes, the World Health Organization said Thursday, warning they must be treated in line with other Study: e cigarette users with substances linked to bladder cancer in urine Health professionals reluctant to recommend e cigarettes to cancer patients Dentistry.co.uk 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 Switching from Smoking to E Cigarettes Reduces Carcinogenic Exposure: