No, don't really see any real reason it seems un-natural unless there is something to laugh about. Lol sometimes I try to seem in a better mood than I am but not to the extent I pull off a convincing smile....doesn't really work if you force a laugh/smile and you have an empty stare I think most people just prefer I didn't try in those instances...

I did try for a while in like middle school thinking it might make me easier to approach, all I really got out of it is my face hurting no real bonding with any other students or making actual friends just took longer for people to ostracize me since I guess it made me seem more normal essentially.