Can vaping damage your lungs? What we do (and don't) know Harvard Health Vapes and Popcorn Lungs: A Doctor's Honest Take on E Cigarettes E Cigarette Use, Small Airway Fibrosis, and Constrictive Bronchiolitis NEJM Evidence Popcorn Lung: The Deadly Secret in Your Vape! Did you know that the sweet, tempting flavor in your e liquid could be hiding a chemical called Diacetyl? This chemical, which tastes The Truth About What Vaping Is Doing to Your Body American Lung Association