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[–]Lostcarkeys 6 insightful - 1 fun6 insightful - 0 fun7 insightful - 1 fun -  (0 children)

It makes sense in hospital settings where doctors mask and unmask frequently, work in cold operating rooms (limits moisture buildup) and change masks frequently. Wearing a mask all day long in a 75 degree building is equivalent to having a petri dish attached to your face and operating with reduced O2.