Doctors are warning about a rare but serious lung condition linked to vaping, known as popcorn lung (bronchiolitis obliterans). The disease causes permanent scarring in the lungs' smallest airways, leading to ongoing World Lung Day: WAKE UP! DON'T VAPE UP! European Network Vapers Beware: Exploring the Threat of Popcorn Lung Popcorn Lung: The Deadly Secret in Your Vape! Did you know that the sweet, tempting flavor in your e liquid could be hiding a chemical called Diacetyl? This chemical, which tastes Can vaping damage your lungs? What we do (and don't) know Harvard Health