Yes, vaping is toxic. A U.S. teen developed "popcorn lung" after secretly vaping for three years a permanent, life altering disease. Officially known as bronchiolitis obliterans, the condition scars the lungs' tiniest E cigarettes, Vaping and Your Health Smoking Facts Pacific Medical Centers Modeling Cardiovascular Risks of E Cigarettes With Human Induced Pluripotent Stem CellDerived Endothelial Cells JACC E cigarette flavorings may damage cilia production and function Harvard Gazette In secondhand vape, scientists smell risk American Heart Association Canadian Teen With Popcorn Lung Like Vaping Illness May Never Recover Business Insider