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this post was submitted on 26 Aug 2023
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Let's tighten this up a bit.
Inert gas asphyxiation is very much a great way to go, but it's basically symptomless until after you lose consciousness.
You don't get high. The "high" people get is when they are choked out. I'm not really sure on the mechanism of that, though. You don't get lightheaded. The lightheadedness is from the blood oxygen levels increasing.
This is why it's very dangerous to enter enclosed spaces. You simply don't know you're about to die until it's too late. Plus, people come in to try to rescue you and succumb as well.
Anyway, lots of people have this experience. It's a common part of training for rebreathers for use in scuba diving.
As far as good ways to die, inert gas asphyxiation is up there with "proper" lethal injection (i.e. with a commercial euthanasia drug), opiate overdose, or just anesthetizing the being and doing whatever gets the job done.
Nitrogen can cause a "high" (aka nitrogen narcosis), but this effect only occurs at high pressures. So it is only a practical concern for divers, because they have to breathe high pressure air. Some divers replace the nitrogen in their tanks with other gases to avoid it.
It is unrelated to asphyxiation, and can occur even when the lungs are properly exchanging oxygen and CO2. It is a poorly understood direct interaction between high pressure nitrogen and the brain that does not occur at atmospheric pressure.
Correct. Extremely different thing.
Also, despite what they say in fight club, oxygen does not get you high either.
Nitrous oxide however...
When I did my deep diving certification one of the things they got us to do was try and do maths of varying complexity (compared to previously doing it on the surface). I didn’t feel high at all, but most of us had slower response times and more errors at depth, apparently as a side effect of the increased nitrogen. Pretty wild.
IIRC the hypoxia ~~"high"~~ panic reaction is from an elevated level of CO2 - that's the evolved mechanism by which humans detect they're in a bad place for breathing. Not absence of O2.
Edit: Correction: Hypoxia alone gets you high just before you keel over. It's the CO2 buildup that activates your body's panic reactions.