[ColdNoMore]

Originally Posted by Slapnut

The problem with wearing them is that you are constantly breathing your own nitrogen which disrupts your pH balance in the body. You're not getting the amount of oxygen to your brain that you normally do. It's going to be too late when people start having problems due to misconceptions about needing to wear these useless masks. Ask any doctor or nurse.

I (as I'm sure many others) would be very interested, given that doctors and nurses wear masks all day these days, in a legitimate/scientific link...that proves your assertion(s).