A merry heart doeth good like a medicine: but a broken spirit drieth the bones.

Well, isn't God's word always true? I am an inquisitive girl and have a need to check out the facts on almost everything! even the word of God!! And guess what? science actually backs up this part of God's word! Laughter is a great medicine. Studies have shown that laughter makes you happy by releasing endorphins, or happy hormones. An endorphin rush is often linked to an adrenalin rush (like the excitement encountered after winning a race or some other exciting event!) This "adrenaline rush" leaves you with a sense of well being and peace.
Stress has been shown to raise cholesterol levels but humour decreases the stress hormone, Serum Cortisol.
Don't take my word for it! check it out yourself.