[Sacre]

Well with the heavy breathing from all that movement, plus the amount of mags you go through in such a short time. Sounds like you're huffing a lot of propane over a short period, could be from the smell itself. Smells that may not be harmful will still cause headaches if inhaled, think of it as an irritant.

I'm not sure if Propane would do that specifically, but I'll go ahead and ask my professor to see what he says on the matter.

Edit: "Exposure to propane can result in nausea and headaches" From what I was told, so taking into account you're firing off that many mags, huffing from moving so much, and the gun is always close to your face. I believe the propane is causing the headache, now I know this probably doesn't answer your question if its harmful or not, but from what I was told it isn't harmful. I got the basic "If you feel nausea, or begin to get a headache remove yourself from the presence of propane". Kind of hard when you're weapon is propane operated, lol.

Don't think I did any good here