Not nerve gas, but the fumes contain organophosphates, similar to what's in sheep dip, hence older 146 pilots talking and writing funnily
. I had a smoke evac after an APU seal let go, fortunately on stand, and it isn't pleasant at all.
I'd hate to get the blood tests done as I have a fear of getting grounded and put in an old folks home (i'm 37!) Plenty of use of ieSpell in all my posts though.......