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[–] 23924238? [S] ago 

https://news.stanford.edu/2020/04/14/stanford-researchers-reengineer-covid-19-face-masks/

Read the article from Stanford: "N95 masks are estimated to reduce oxygen intake by anywhere from 5 to 20 percent. That’s significant, even for a healthy person. It can cause dizziness and lightheadedness. If you wear a mask long enough, it can damage the lungs. For a patient in respiratory distress, it can even be life threatening."

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[–] 23927382? 0 points 1 point (+1|-0) ago 

I stand corrected. Thanks for the link. I've seen Chinese masks with electric fans which, perhaps, is meant to address this.