Distancing and hand-washing come first, of course. And keeping hands away from face! Having done work with a respirator in hantavirus zones, I have good discipline. But I see people in lineups rubbing their faces and noses, and it makes me mental. Geez, people.
However, the reason I wear a procedure mask is to reduce potential spread to others (especially out of respect for the retail workers who bravely soldier on). Hey, I feel fine. But am I contagious? There's no way to know. Many super-spreaders show no symptoms. That's what's unique about this virus. Everyone should wear a mask, so we can get back to normal sooner.