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TV celebrity, who uses cannibis to relieve pain from multiple sclerosis, pushing wider availability of medical marijuana

Laughing with friends releases feel-good brain chemicals, which also relieve pain, new research indicates. Until now, scientists haven't proven that like exercise and other activities, laughing causes a release of so-called endorphins.

The hormone oxytocin, which has been shown to increase trust and social bonding, could also work as a treatment to relieve pain in those who suffer from frequent headaches, according to a new study.