[mcguire]

"We already know vaping causes popcorn lung."

We know that vaping fluid with a particular flavoring chemical caused popcorn lung. That chemical is now rare.

"The chemical that gave this condition its nickname is diacetyl. After workers at a factory that packaged microwave popcorn were found to have bronchiolitis obliterans more often than other people, some companies stopped using diacetyl as a flavoring. But it's still used in some electronic cigarette flavors in the US. Many e-cigarette makers state they aren't using this chemical in their products and its use in e-cigarettes is banned in Europe." (https://www.webmd.com/lung/popcorn-lung#1)