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. Smoking and Vaping National Institute of Environmental Health Sciences 5 Common Vaping Myths Debunked With Facts Grey Haze UK Can vaping damage your lungs? What we do (and don't) know Harvard Health Vaping It's No Smoke and Mirrors When it Comes to Urinary Health Issues The Urology Group How To Smoke A Vape Like A Pro