Where did you get your information from. Ask most nurses and doctors who will tell you that breathing in and out your own nitrogen is bad for your body. The pH level isn't balanced and this will result in not enough oxygen to your brain. You're also breathing in and out your own bacteria which isn't good for your body. Go ahead and believe what you want but if we were meant to breathe through masks,we would have been born with them. Also don't force what you feel is right on other people
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