The only difference is that Thailand generally uses the 'smile' represents all the senses. Whether happy, sad or in a bad situation much the same as Thailand was still smiling encouragement.
But the difference is that Thai people smile often used to represent each feeling. No matter how sad or glad the worst situation in which Thai people size still will always smile like a cheer.
But the difference is that Thai people are often used to show up to every smile, feeling glad or sad, whether it is in a situation where a bad Thai people, they still like to be smiled at. Always with the encouragement,