According to another study I read runner's high is caused by endocannabinoids. http://www.eckerd.edu/academics/biology/faculty/gerdeman.php http://www.eckerd.e

According to another study I read runner's high is caused by endocannabinoids. http://www.eckerd.edu/academics/biology/faculty/gerdeman.php http://www.eckerd.edu/academics/biology/faculty/gerdeman.php Edit: Oops wrong link: http://news.nationalgeographic.com/news/2012/05/120510-runners-high-evolution-people-dogs-science/ http://news.nationalgeographic.com/news/2012/05/120510-runne...