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> A properly worn mask necessarily obstructs breathing.

I’m really not sure why people keep claiming this, as if a lot of us haven’t been wearing a variety of masks for years at this point.

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If wearing a mask doesn’t make it noticeably more difficult to breathe, most likely you have air bypassing the mask—look for gaps and try to get a better fit.

My KN95s put visible lines on my face the day after and make my ears hurt like hell. They're sealed, and I can tell I'm breathing through one. But "difficult", nah.

Then we’re on the same page. It’s necessarily comparatively more difficult to breathe with than without, that’s how you can tell you’re breathing through a filter. (The absolute degree of difficulty depends on the individual and preexisting conditions.)

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