Breathing oxygen isn’t a choice, though. You have to go to great lengths (such as inserting yourself into an environment where it isn’t breathable, such as vacuum or deep water) to stop breathing it for more than a few minutes before your conscious control is overriden.
Breathing oxygen isn’t a choice, though. You have to go to great lengths (such as inserting yourself into an environment where it isn’t breathable, such as vacuum or deep water) to stop breathing it for more than a few minutes before your conscious control is overriden.