Back when we still had a large garden, we had a bumper crop of various kinds of peppers with all different levels of heat. I froze some, made salsa and still had a bunch left over. So, I spent a day smoking batch after batch, dried them and then ground them in Grumpie's coffee mill. All went well until I ground one batch a bit too fine and the dust became airborne. On large inhale later and I was coughing, wheezing and tearing up like crazy.
It did make for some really great chili powder though. things also might have gone better for me the next morning if I had actually mentioned to Grumpie about using the grinder on hot peppers before the morning coffee was ground. lol!