Patch Adams said this quote

Remember laughing? Laughter enhances the blood flow to the body’s extremities and improves cardiovascular function. Laughter releases endorphins and other natural mood elevating and pain-killing chemicals, improves the transfer of oxygen and nutrients to internal organs. Laughter boosts the immune system and helps the body fight off disease, cancer cells as well as viral, bacterial and other infections. Being happy is the best cure of all diseases!