Smiling is healthy and has an effect like medicine. It all goes easier with a smile. A smile is the prettiest thing you can wear. These are just a few of the most common quotes about smiling.
For me personally, smiling is important. Of course because of my job too since many of the commercial clients expect a refreshing and real smile. However I love to laugh in private as well. I always try to go through my life with a smile on my face and see the things in a positive way.