Experts warn that flavored e cigarettes can cause irreversible lung damage, as seen in a U.S. teenager who developed "popcorn lung"a severe and permanent condition called bronchiolitis obliteransafter secretly vaping for three years. 9 Conseils pour viter la remonte de e liquide de votre e cigarette In early 2026, medical research has solidified the link between flavored e cigarettes and irreversible respiratory conditions, most notably bronchiolitis obliterans, commonly called "popcorn lung". This disease occurs when chemical flavoring agentssuch as Why is the Royal College of Physicians concluding e cigs reduce harm while ignoring the substantial associations between e cigs and actual disease? Stanton Glantz blog