> The MSDS for that jar of peanut butter says it's not an asphyxiant... as someone with peanut allergy, I beg to differ ;)

Just in case the sarcasm wasn't abundantly obvious, the precise term used was simple asphyxiant with the following regulatory meaning[1]:

>> Simple asphyxiant means a substance or mixture that displaces oxygen in the ambient atmosphere, and can thus cause oxygen deprivation in those who are exposed, leading to unconsciousness and death.

[1] https://www.osha.gov/laws-regs/regulations/standardnumber/19...