Yup. And if you are wearing safety glasses they cause the lenses to fog up so you can't see shit.Thing is that these mask fall off and you start to grab at it to fix. Not to mention the sweat and humidity of ones breath.
Although in this scenario I'll admit the mask is effective against The Rona. It will stop particles from entering your mouth and nose, the fogged glasses will keep droplets from getting into your eyes, and you won't be able to touch your face to fidgit with your mask because you just cut them off on a table saw.