@outofelement
Only N95 masks are effective and only when everyone wears them because they prevent exhaling viral substances, not enhaling.
As for "breathing just fine" that's absolutely not true. I couldn't stand wearing them and they often caused headaches and trouble breathing.
https://www.thelancet.com/journals/ebiom/article/PIIS2352-3964(24)00192-0/fulltext
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