Can oxygen damage be toned down

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Oxygen damage typically goes away in a matter of seconds once you're breathing again. However, if you fall into crit, that means you're either having or are about to have a heart attack. The main way heart attacks kill you is by rendering you unable to breathe (or more accurately, preventing you from getting any oxygen from the air you're breathing). In other words, if something puts you well into crit but doesn't kill you, oxygen deprivation is what will finish you off - even if you're surrounded by breathable air. Seems like you might be blaming small air loss for the suffocation caused by your heart failing to do its job.