I remember reaching mile 26 of The Western Hemisphere Marathon and thinking blissfully “this feels great!” For some runners, it might have even felt familiar. Sure enough, researchers throughout the world are illuminating the important role of the cannabinoid system in our experience of altered states like joy and the “runner’s high.” As a recent NY Times article mentions, a strenuous run on a treadmill increases the body’s own natural cannabinoids. Rodents with an impaired cannabinoid system don’t…