Diacetyl in Electronic Cigarettes: What you need to know! E Cigarette Direct Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360 Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360 Diacetyl & Popcorn Lung EDGE Vaping A Comprehensive Guide of Vaping LOST MARY 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