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: What is it, and who is at risk? Harvard Health Does Vaping Or Smoking Marijuana Cause Lung Cancer? SERO Popcorn Lung Causes, Symptoms, Diagnosis, and Treatment Can vaping cause cancer? The evidence suggests it might. The Washington Post