SMILING IS ALWAYS CONTAGIOUS. SOME PEOPLE THINK IT IS VOLUNTARY ACTION WHILE SOME THINK IT IS NON VOLUNTARY ACTION. THERE ARE A LOT OF REASONS TO SMILE. SOME OF THE BENEFITS ARE--
1) IT REDUCES STRESS
2) IT MAKES YOU ATTRACTIVE.
3) IT IMPROVES YOUR MOOD.
4) SMILING HELPS TO LIVE LONGER.
TO READ MORE ABOUT THIS CLICK ON THE LINK -- https://myfitbrain.in/blog/i-want-to-smile.