Frontiers Pulmonary function and physical performance in adolescent e cigarette users: a narrative review Yes, vaping is toxic and the consequences can be permanent. A U.S. teenager developed popcorn lung a life altering, incurable condition after secretly vaping flavored e cigarettes for Respiratory Impact of Electronic Cigarettes and Low Risk Tobacco Understanding the Dangers of Vaping: EVALI and Lung Injury NIH Workshop on E Cigarette, or Vaping, Product Use Associated Lung Injury (EVALI): Developing a Research Agenda NHLBI, NIH