Your air is pumped in an out by your lungs, not ambient pressure. You determine the velocity of the air with your breath - breath in quickly or breath out quick

Your air is pumped in an out by your lungs, not ambient pressure. You determine the velocity of the air with your breath - breath in quickly or breath out quickly - that has nothing to do with the mask. Wetter air leaves your lungs, but air quickly goes to ambient and then takes on ambient air humidity anyways, so not sure how relevant to the people around you. And again, ambient air pressure has nothing to do with it. you determine the pressure with your lungs. If you breath in as quickly as you breath out, you will have similar air speeds and pressures.