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26 11, 3:46am
Masks also lower the blood oxygen level, weakening your body overall. Incidentally one of the symptoms of the new chinese flu is that it lowers the bodys ability to transport oxygen around. As such masks actually mimic part of the disease they are allegedly meant to prevent. Which they don't and can't.
Get an oxymeter, measure it for yourself. They are cheap and give results in five seconds.