E-cigarettes are very popular right now and many teens are using these devices. We are only just now starting to see the conclusions of research into the potential health effects of using these devices. This study from The Harvard University Chan School of Public Health explores the connection between e-cigarette flavorings and severe respiratory disease.

http://www.hsph.harvard.edu/news/press-releases/e-cigarette-flavoring-chemicals-linked-to-respiratory-disease/