An American have a question about Japanese.
"Why do most Japanese is wearing a mask ?"
I'll tell you the reason.
Because they are protect from a flue and a cold.
Some women have another reasons. You know, most women want to be thought beautiful, so we need much time to put on a make up, but if we wear a mask, we don't have to do it.
The ranking of the reasons
①to hide for not wearing make up
②to keep warm of our face and skin
③to show our face smaller