There’s little doubts at this point there are legit medical uses for various compounds found in Cannabis – some of which are only now being examined in depth via ongoing research. Current legal control status in the US and stigma have prevented most medical researchers from touching it, but that appears to be changing finally. Various states in the US allow for medical cannabis (MC) use and the number of states allowing MC growing rapidly. Each state has it’s own approach and laws and list of ailments (see below) medical cannabis is approved for ranges state to state.
The endocannabinoid system for example is a fast emerging area of research. Several compounds found in cannabis (Phytocannabinoids) directly impact this system. The best known of course is Delta-9-tetrahydrocannabinol (THC), the most psychoactive of them. Others however appear to have direct effects and benefits, and having no psychoactive effects, such as cannabidiol (CBD) and cannabinol (CBN) which appear to have anti inflammatory and possible anti cancer effects. Various pharma companies are looking into compounds that target receptors in Endocannabinoid System and is an emerging target of Pharmacotherapy for a wide range of human diseases.
Marijuana and some individual compounds found in Marijuana, are being looked at for PTSD and several recent studies suggest benefit and various states have approved medical Marijuana for PTSD, and others, but check with your state for specifics.