The Evolution of the Endocannabinoid System and How Cannabinoids Help Relieve PTSD, Pain, MS, Anxiety, and MoreAn informative read for an audience interested in why and how medical cannabis helps treat a range of illnesses--maybe all of them.With cannabis approved in 11 states, the District of Columbia, and two U.S. territories; medical cannabis approved in at least 34 states; and hemp (very-low-THC cannabis) off the controlled substances list, millions now treat their ills with medical cannabis or non-intoxicating cannabinoids like CBD. But lots of them don't know why or how cannabis works in the body.