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It was discovered in World War II that people with a good sense of humor survived the concentration camps than people who never laughed.
Scientists in USA have found that laughter is a prime stress reliever. It can cure headaches, fights infection and also helps to reduce blood pressure.
Adrenalin and endorphins are natural hormones of the body, which gives us a feeling of happiness and these rise with laughter. Our muscles in the abdomen and chest get a good exercise since laughter causes us to take deep breaths; we also inhale a large quantity of oxygen which revitalizes the body. So, laughter not only helps by releasing stored up tensions which make us feel stressed, but also helps us to live longer.