WHO estimates at least 15 million teenagers use e cigarettes worldwide Reuters Youth Vaping Consistently Linked to Smoking, Marijuana, Alcohol Teenagers who vape sweet flavoured e cigarettes more likely to stick with habit, study claims The Independent The Independent E cigarette Use Persists Among Youth, New Data Shows Health Matters NYP Global study zeroes in on vaping's respiratory risks among exclusive e cigarette users What You Need to Know About Vaping American Heart Association