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>Together, those often cause euphoria, altered states of consciousness, and cognitive shifts not too far off from psychedelics.

It must vary between people, because no matter the environment if I breath too eager, whether on purpose or accidentally (like working out) it just becomes really hard to think, everything starts to tingle and all my muscles lock up. A very not-fun time. Also dangerous with weights.

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The tingles and muscle cramps (tetany) are a normal byproduct (basically your neurons on your smallest muscles and under your skin get more excitable due to a molecular rube goldber machine set off by lower CO2 balance in your blood). It's uncomfortable, but unless you are suffering from epilepsy not dangerous and there's no lasting effects.

I did a longer writeup on the physiological effects here if you're interested: https://docs.google.com/document/d/1RuDv_E9osM1CCFWZMywMru9J...

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