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. Popcorn Lung: The Zombie Vaping Myth That Refuses to Die Doctors Say Vaping May Be Causing 'Popcorn Lung' Does Diacetyl in Vaping Cause Popcorn Lung? Clutch Vape Diacetyl & Popcorn Lung EDGE Vaping No, Vaping Doesn't Cause Popcorn Lung Let's Set the Record Straight