He'll learn his lesson when he gets a bad case of Legionnaire's Disease from breathing in all that crap. I know the feeling, though. An old cowboy saying I like to repeat - you can lead a horse to water, can't make him drink...
I had a former friend of mine whom I've talked about here before, that was going crazy trying to control spider mites in his grow facility. He was spraying everything and anything he could get his hands on, including Eagle 20, a huge no-no for cannabis, AND sleeping in the grow room with all that shit, breathing it in, getting it on his skin, etc.
When I started to notice significant behavior changes in him, I took it upon myself to come treat his shit with that Agromagen Growsafe Biopesticide. He didn't think it was going to work and we almost got into a fist fight over it, but he broke and let me spray his plants and thanked me for it later. Dude was out there to begin with, but man he was talking about seeing shit and having lucid nightmares and shit so I had to get him out of that situation