Easy, it affects the flux of air going through. But it still goes through and spreads far.
$1000 question back at you, if you have go in a room where there is deadly particles present in the air that kills you, would you have balls to go in with TWO Ginette brand masks?
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the 1 million $ question for you than, if you don't have a choice but to go in, would you go without a mask or the Ginette brand mask if nothing else is available?
btw a few days ago I was arguing with friends about the fact that unless there's a specific context it's not worth wearing a mask, so keep that in mind, I'm not for being obligated to wear the mask, as it obviously doesn't make sense in a lot of contexts, but as usual, because of a couple of idiots well, we have our liberties restreined once more, at least the motive doesn't look to be related to more "control".