OldChamKeeper
Chameleon Enthusiast
I'm actually very curious about this too. That's a very very good question. I sometimes spray air freshener, not much since I got my Cham, but the question definitely is legit! I hadn't really considered that with a Cham but now I am!
I have a stupid amount of experience in both seeing critters die (years of retail experience and forty years of keeping pets) and also a knack for eliminating possibilities to find logical paths. What you described is not common from my experience. Such gaping and the suddenness of the incident (if correct as described) is similar to what a kids panther did after Raid had been sprayed in a far corner of the room it was kept in, yet they had a celling fan on. While I still don't think that was the cause of death, I think they forgot to wash their hands since they fed it not long after using the insecticide, their animal did the same thing you described.