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. 10 Strategies Big Tobacco and E Cigarette Companies Use to Target Kids American Lung Association Vaping Illness Tracker: 2,506 Cases and 54 Deaths The New York Times Vaping harms your health Cancer Institute NSW