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If it's not oxygen it shouldn't go in the lungs. Full stop.
The 78% nitrogen hanging out in the atmosphere begs to differ
You can also breathe in smoke, that doesn't mean that you should. Can and should are the keywords here.
So you're saying that I shouldn't breathe in nitrogen? There's a thing called "oxygen toxicity" which can be caused by breathing pure oxygen and so actually breathing things other than oxygen is vital to our health.
Ok.
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