Can vaping damage your lungs? What we do (and don't) know Harvard Health It's official. Flavored e cigarettes cause permanent lung damage. And doctors are already seeing it happen. In the United States, a teenager developed something called popcorn lung after secretly vaping for three years. The Lessons of Popcorn Lung: Inhale With Caution Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association Popcorn lung: What is it, and who is at risk? Harvard Health