Besides boosting your immune system...Laughter:

Laughter and humor help you stay emotionally healthy

Laughter makes you feel good. And the good feeling that you get when you laugh remains with you even after the laughter subsides. Humor helps you keep a positive, optimistic outlook through difficult situations, disappointments, and loss.

More than just a respite from sadness and pain, laughter gives you the courage and strength to find new sources of meaning and hope. Even in the most difficult of times, a laugh–or even simply a smile–can go a long way toward making you feel better. And laughter really is contagious—just hearing laughter primes your brain and readies you to smile and join in the fun.

The link between laughter and mental health

• Laughter dissolves distressing emotions. You can’t feel anxious, angry, or sad when you’re laughing.
• Laughter helps you relax and recharge. It reduces stress and increases energy, enabling you to stay focused and accomplish more.
• Humor shifts perspective, allowing you to see situations in a more realistic, less threatening light. A humorous perspective creates psychological distance, which can help you avoid feeling overwhelmed.