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. Evaluating the Toxicity of Electronic Cigarette Aerosols for Firsthand and Secondhand Exposure Under Different Device Operating Conditions Chemical Research in Toxicology Vaping related pulmonary granulomatous disease ScienceDirect Reversible Lung Damage After Vaping What Does Vaping Do To Your Lungs Can Your Lungs Recover From Vaping Cigarettes Australia