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RememberKosciuszko 1 point ago +1 / -0

Try to run/dash with full speed with one of these on your face for 15 seconds - you are screwed for the next 15 minutes instead of recovering in minute or two

Re-breathing CO2 and all the other junk you expell is nightmare for the body

Human body needs to expell all the waste without any restrictions through breathing, sweating and every other way - period