rubseb t1_iy2tfyl wrote
Reply to comment by Nexusowls in Eli5: Old Three Stooges episodes show people occasionally breathing into paper bags as some sort of remedy for emergency situations involving stress or trauma… what was the belief then and what do we now know better about the practice? by coffeygrande
No. Over-saturation of O2, i.e. hyperoxia, certainly isn't healthy but the symptoms aren't as acute, and the partial pressure of oxygen in normal air simply isn't high enough to cause oxygen toxicity (at sea level pO2 is about 21 kPa and toxicity only occurs above 30 kPa). That is, no matter how fast you breathe, in normal air you can never raise your blood oxygen to toxic levels.
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