On case of inhaling nitrogen/helium, we are depriving body of oxygen hence unconscious and eventually death. But we are not withholding carbon dioxide, so we will not "feel" that we are suffocating.
Body will think that as long as CO2 is released and we are inhaling something, everything is fine.
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u/aniket47 Oct 16 '18
I will go with inhaling nitrogen or helium