Smiling doesn't mean the persons are happy. In Japan, people always smile when providing service but the stress level is the world highest. I dun think Japanese are happy people.
Lets not get confused with smiles from the service industry versus smiles from the general populace (which we are refering to here)... Heck, those service-related you go to karaoke bars you also get "smiles" whad? :bsmilie: