nitro fumes are poisenous
but really only in great or daily quantities

when every day you start your engine
in your closed garage or so
or indoor tracks

even for almost a w.e. 3 days race in an indoor track at some time
pilots didn't see but their car's rear wing
doing rabbit jumps, that's all

I did run and jump, and run and jump
in that smog for hours marshalling
and I didn't feel anything funny ....