You can repeat all you want, without the proper mask it doesn't work, period, no matter if you wear it or I wear it or if you don't or I don't it's the same thing. If it's not the proper mask it does not matter it still is spread. Maybe you should wear one of those pretty little mask in an oxygen deficient atmosphere and I'll wear a proper oxygen supplied and we'll see how it turns out. Bet you turn blue and I want. Now repeat that. And if protection doesn't prevent then everything I've ever been taught is wrong. Hey man, does a contraceptive protect or prevent? You truly are a funny guy!!