[John_KZ]

I feel like most of these experiments don't control for air temperature. I feel like cold air has a much more rejuvenating effect than just lowering CO2 levels. Not that they don't matter, but it's not like you'll instantly feel better.

[jodrellblank]

Why won't you "instantly" feel better? Instant meaning a few breaths of outside air, anyway, likely well within the claimed 5 minutes.