Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association Medical professionals are warning about bronchiolitis obliterans, commonly called "popcorn lung," a serious and permanent lung condition increasingly associated with vaping. The condition damages the smallest airways in the lungs, causing symptoms What is Popcorn Lung, and Can it Be Caused by Using Marijuana? What Does Vaping Do to Your Lungs? Johns Hopkins Medicine