Flavored e cigarettes are not harmless. Doctors are now seeing teens with permanent lung damage from vaping. In the U.S., a teenager developed popcorn lung after vaping in secret for three years. This What is Popcorn Lung, and Can it Be Caused by Using Marijuana? Popcorn Lung and Vaping: What UK Vapers Need to Know ePuffer What is Popcorn Lung? Understanding This Serious Respiratory Condition SMOKO E Cigarettes The Truth About What Vaping Is Doing to Your Body American Lung Association