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. Some e cigarettes contain chemicals that cause popcorn lung Vox Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360 What Is Popcorn Lung and Why Is It Being Discussed? iSmokeKing.se