Will chronic e cigarette use cause lung disease? Thoracic and Sleep Group Queensland Some e cigarettes contain chemicals that cause popcorn lung Vox Dermatologic manifestations associated with electronic cigarette use ScienceDirect Dartmouth led Study Shows E Cigarette Switching Can Ease Respiratory Symptoms Geisel News Impact of Electronic Cigarettes on Oral Health Viewpoints: Is the jury still out on e cigarettes? NZ Drug Foundation