Living the high life: high-altitude adaptation

There were videos addressing this very point here yesterday, showing that even wearing 3 masks, an anesthesiologist showed his O2Sats were at 99 - 100%. Another video was made by a nurse w/ asthma who wore various masks while exercising, and her O2Sats st

I'll go you one better - I used to chain-smoke cigars when I quit drinking. I went in for an endoscopic procedure, and the Oximeter alarm kept going off because my O2Sat stayed ~85%. It was an adaptation to my constant inhalation of CARBON MONOXIDE from t