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Studies show people who smile more tend to live longer than those who don’t.  It seems the simple act of smiling causes a positive emotional state in a person!  Of course, smiling can have a positive effect on those around you as well.  

It has been shown that waiters and waitresses who smile generate larger tips, especially if there’s a little huzzlecoo, or flirting thrown in!    Fake smiles are 10 times bigger than genuine smiles, because they’re meant to be seen!   The  TV news anchor who wishes you “Good evening”  and then proceeds to tell you why it isn’t, is a good example of a person feigning a smile.  What's a word for someone who fakes a smile?  An eccedentesiast! 

Women generally smile more than men.  Apparently, the smile muscle, or the zygomaticus major, is thicker in gals than in guys. However, it's unclear whether females are born with a bigger smile muscle, or if it just bulks up from more exercise.