I've gotten a few questions about studies recently, so I thought I would share this link again. It is a 750 page PDF of studies related to cannabis and the endocannabinoid system. Herein, NIH is referenced 4,412 times and the NCBI 4,320 times. Search through a few of them, when you have the time. Many of these references are hyperlinks to publicly available studies, and many of those studies are the 'gold-standard' of scientific rigor, the double-blind, placebo controlled study.
I want to share this information, because I hear people say they wish that there were more studies on cannabis before making it legal. That argument simply doesn't hold weight since cannabis is one of the most studied plants in history.