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 Vaping in Youth: The Dual Threat to Heart and Lung Health How to Understand Vaping's Dangers RSDC E Cigarette Research for Lung Cancer Patients Roy Castle EVALI: Symptoms, Causes, & Diagnosis E cigarette smoke caused lung cancer in mice ecancer