Smile is a sign of joy while hug is a sign of love. Laughter, on the other hand, is a sign of inner happiness. None of them are at the level of mind or intellect. All come from within the heart.

They are only the gradations of your expressions of your happiness.

It is said that you are incomplete in your dress if you are not wearing a smile on your face. Hug comes next, and laughter the last.

Laughter is like an internal jogging and has benefits like that of doing meditation.

But be careful, we must know when not to laugh. The most difficult is to laugh at ourselves.