WHO estimates at least 15 million teenagers use e cigarettes worldwide Reuters High Nicotine Vapes Don't Increase Nicotine Use Compared With Smoking, Study Finds Global study zeroes in on vaping's respiratory risks among exclusive e cigarette users E cigarettes and Vaping Commercial Tobacco Use MN Dept. of Health Teenagers who vape sweet flavoured e cigarettes more likely to stick with habit, study claims The Independent The Independent Youth Vaping Consistently Linked to Smoking, Marijuana, Alcohol