Cub Driver writes:

At Aspen of course we skied all winter at above 11,000 feet. (At
Loveland, the parking lot was higher than that.) Do you suppose that's
why ski bums are famously so unstable?

You can make up for some deficiency by doing more breathing.
Ed Gauss, an old AK bush pilot, told the story that he'd be
on O2 & his wife would keep awake without, by playing her
harmonica.
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