What is the benefit of smiling?

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Tags

1. #function
2. #helps
3. #smiling
4. #immune
5. #boosts
6. #overall
7. #certain
8. #health
9. #thanks
10. #neurotransmitters
11. #release
12. #boost
13. #relaxed
14. #because
15. #thought
16. #effectively
17. #system
18. #human
19. #actually
20. #improves
21. #smile