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We don't need a precise amount of oxygen - we can survive in a fairly wide range. Think about living in the mountains vs by the ocean.
Nitrogen gets us absolutely high. Balls to the wall high. It's why gas narcosis used to be called nitrogen narcosis. Also known as the "rapture of the deep".
Also, oxygen gets you high. Also, oxygen kills you, but that's another matter.
It’s pretty amazing we’re alive at all, when you put it that way.