Vaping on the rise in U.S., especially among young people Pew Research Center The risks of vape pens' secondhand aerosols Young people who vape are 3 times more likely to take up smoking cigarettes. Vaping can lead to lung damage and can be harmful for young brains, which are still developing until Vaping: How popular are e cigarettes? Study Finds Ninth Graders Who Used E Cigarettes More Likely to Smoke WSJ