In Japan,many people wear a face mask,even though they do not have cold.This looks strange to many non-Japanese people.Even to me,this looks strange too.But there are some reasons;

1 They actually got cold.
2 Ladies want to hide their faces because of the lack of make-ups.This is why more Japanese women wear a face mask than men.
3 Masks hinder virus from spreding
4 In a cold and dry winter air,a face mask makes our breath warm and breathing easier.
 

 
A woman,former colleague,wears a face mask all the year around.So I asked her if it was annoying to wear it all the time.She said that breathing was easier in winter and she could skip makeups,save much time in the morning.That made sense to me at that time,but later I realized her habit could make respiratory organs weaker.
 
Wearing a mask have some advantages,but this NEVER happens in the U.S.
 
I heard that one of the reasons why American people never wear a face mask is that people hiding his or her face can be seen suspicious.I have seen hundreds of American movies and dramas,but never seen even a single character who wears a face mask.
 
Maybe this is going to change.
 
Now the virus is rampant globaly.I am still not sure whether a face mask works as a protective equipment,because some health experts are denying effectiveness.But judging from the fact that medical workers do wear a mask, it can help to prevent the virus.