I read that the feeling of needing to breathe is actually triggered by CO2 buildup, not oxygen deprivation. So if you breathe pure N2O, you might lose that war

I read that the feeling of needing to breathe is actually triggered by CO2 buildup, not oxygen deprivation. So if you breathe pure N2O, you might lose that warning that you need to breathe oxygen. When I played with N2O, I noticed that the high was more intense if I rebreathed or otherwise deprived myself of oxygen. And it also would cause cognitive issues in the weeks after taking it, probably due to oxygen deprivation. I stopped taking N2O after that.