I ask because people in public dont smile as often as they should, I think. As for me I constantly smile because its better than frowning........... 
Conversely, my neutral face is said to be one of utmost misery. I was once told someone was afraid to approach me because I looked very angry, when I definitely wasn't so.Outright Villainy said:Well my neutral face is close enough to a smile, so I guess you could say all day, for the most part.