Emotions whether good or bad are contagious. In general, I consider myself a happy person, but I would not classify myself as a smily person. I can feel perfectly happy and not smile, but when I am REALLY happy I have caught myself walking down the street smiling.
Join me in my New Year's resolution to smile more, I think you will find you are happy you did.
Thich Nhat Hanh wrote, “Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy.”