Don't be an agelast: one who never laughs (especially at jokes); a mirthless person.
Click HERE for an article on that.
“The best kind of laughter is laughter born of a shared memory.” -- Mindy Kaling
And this is really good...
"Hearty laughter is a good way to jog internally without having to go outdoors."
Cousins was known for his use of laughter to help him in his painful collagen illness. Laughter helped him amazingly.
Look for the laughs in life. They're good for you - and me.
So YES, laughing is good medicine!