Other study shows that the effect is mediated through endocannabinoids not endorphins (But the effect is very real): http://www.ncbi.nlm.nih.gov/pubmed/1462544

Other study shows that the effect is mediated through endocannabinoids not endorphins (But the effect is very real): http://www.ncbi.nlm.nih.gov/pubmed/14625449 http://www.ncbi.nlm.nih.gov/pubmed/14625449