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. NIH Workshop on E Cigarette, or Vaping, Product Use Associated Lung Injury (EVALI): Developing a Research Agenda NHLBI, NIH Is Vaping Worse Than Smoking? St. Vincent's Medical Center 5 Common Vaping Myths Debunked With Facts Grey Haze UK