You're not wrong, but it's more complicated than that. Some Japanese wear them for fashion reasons, just because everybody else is wearing one. Some (usually wo

You're not wrong, but it's more complicated than that. Some Japanese wear them for fashion reasons, just because everybody else is wearing one. Some (usually women) because wearing a mask means you don't have to wear lipstick in public, which means you can get out the door faster in the morning. And a lot of people (wrongly) believe that a mask helps keep you from getting sick. If only the sick wore them you wouldn't see nearly as many as you do on the streets in Tokyo.