I'm too, curious about that. I too popcorn-roast my coffee about once in two weeks on my back yard though some smoke finds its way inside. Been doing that for 6

I'm too, curious about that. I too popcorn-roast my coffee about once in two weeks on my back yard though some smoke finds its way inside. Been doing that for 6 years or so with no noticeable side-effects, though I'm not sure how immediate does diacetyl affects your (my) lungs.