The less 02 you breath in, the more the CO2 build-up and, per the Bohr effect, the more efficiently you'll absorb the 02. Just don't mouth breath and you'll be

The less 02 you breath in, the more the CO2 build-up and, per the Bohr effect, the more efficiently you'll absorb the 02. Just don't mouth breath and you'll be fine. Actually, you'll be healthier because of it.