Studies in the UK found that a single smile can generate the same amount of brain stimulation that 2,000 chocolate bars or 16,000 Pounds Sterling ($25,000) can, which means a person can feel like a million bucks just by smiling a certain number a times a day.
There is a an interesting article on Forbes titled, “The Untapped Power of Smiling”. Ron Gutman, the author of the article, explored the power of the smile and found studies of smiles being able to predict: how long lasting individual’s marriages would be, how high individuals would score on standardized tests of well-being and happiness, and how inspiring they would be to others. The research showed that the widest smilers consistently ranked highest in all of the categories. Another study found that players that smiled on their baseball cards had a longer average life span than those that didn’t.