I used to have to wear a respirator for many hours a day due to work.. Used to get the worst and most persistant colds. Virus spread inside our own bodies not just person to person and re-inhaling Virus laden vapor is going to spread the virus faster and furthur inside you... This is probable somthing you will hear later after the panic subsides. They want people to Die so anything the MSM recomends is probable bad for you....