One of the most serious risks of vaping? A condition called popcorn lung, or bronchiolitis obliterans. It's rare, but when it hits, it's permanentscarring the smallest airways in the lungs and causing The Truth About What Vaping Is Doing to Your Body American Lung Association Doctors are warning about a rare but serious lung condition linked to vaping, known as popcorn lung (bronchiolitis obliterans). The disease causes permanent scarring in the lungs' smallest airways, leading to ongoing Teenager Diagnosed Of 'Popcorn Lung'; Doctors Suspect Vaping Habit CodeBlue