By how much do they slow transmission?
> It's not fun but I see it as a minuscule sacrifice for me to wear a mask to the grocery store if it saves even one person a trip to the hospital
People go to hospital with flu every year. You or I might have unknowingly spread it around and caused someone to go to hospital before. Will you wear a mask every flu season, forever? It's worth it if it saves even one person a trip to the hospital, right?