Masks are not intended to help you. They're intended to reduce the distance you spread anything you may be carrying.
If your grocery store clerk is wearing a mask, they are reducing the chance that you may get sick if they happen to have coronavirus and not know. If you choose to be a selfish person, you can not wear a mask, so the chance you are going to infect the grocery store clerk is not reduced... so in a week they may be spreading it to more people. Or you can wear a mask and possibly help a little.
victor809 wrote: