Laughter cuts down the level of stress hormones namely cortisol, epinephrine (adrenaline), dopamine as well as growth hormone. It also raises the level of health-enhancing hormones such as endorphins.
Laughter boosts the number of antibody-producing cells we have working for us, and improves the effectiveness of T cells. They all help for a stronger immune system, and fewer physical effects of stress.
Laughter provides a physical and emotional release. It can bring the focus away from anger, guilt, stress as well as negative emotions in a more healthful way than other plain distractions.