Mmmm, bronchiolitis obliterans. Being serious, the common name for the disease is "popcorn lung" because it was first identified in a microwave popcorn plant and it's caused by inhaling certain chemicals often used in flavored popcorn.

Right. Yes. Diacetyl and its ilk are not something you want to breathe in, well aware. I used to vape, years ago, and mixed my own liquid. Popcorn lung was always a big topic in the DIY scene.

The workers who developed popcorn lung were working around vats of the shit, breathing in large quantities on the daily. But still, the risk was enough to never trust any buttery flavors for vaping.

Occasionally cooking butter-flavored or butter-laden popcorn is not a problem though.

“Dosis sola facit venenum,” as they say. The dose makes the poison.