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. Menthol added to vapes worsens lung damage, study suggests The Virginian Pilot Vaping Related Illness and Lung Disease NEJM What Does Vaping Do to Your Lungs? Johns Hopkins Medicine E Cigarettes at the Point of Sale Counter Tobacco WHY DOES MY VAPE TASTE BURNT?