A member asked:

When wearing facial mask one inhales back again what was recently exhaled(co2).isnt it somewhat dangerous if mask is continusly worn for a long time?

A doctor has provided 1 answer
Dr. Michael Gabor answered

Specializes in Diagnostic Radiology

Most masks: filter out particles but not gas/air, plus they are rarely airtight around the edges.

Answered 9/7/2017

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