There are different types of laughs; not all the laughs
caused by happiness. Only the genuine laugh has the
strong healing effect and there is a positive link between
laughing and healthy functioning of blood vessels.
Nietzsche said that laughter is a reaction to the sense of
existential loneliness that human feels. And Kurt Vonnegut
said that laughter and tears are both responses to frustration
and exhaustion. And also Victor Hugo said that never laugh
at those who suffer, but suffer sometimes those who laugh.
But the natural, genuine, happy and intelligent laugh is the best
remedy and keeps the heart and face young and freshen soul,
mind and body.