The legalization of non-medical marijuana.
Medical cannabis refers to the use of the Cannabis plant as a physician-recommended herbal therapy as well as synthetic THC and cannabinoids. So far, the medical use of cannabis is legal only in a limited number of territories, including Canada, Belgium, Austria, the Netherlands, the United Kingdom, Spain, Israel, Finland, and some U.S. states. This usage generally requires a prescription, and distribution is usually done within a framework defined by local laws.
There are many studies regarding the use of cannabis in a medicinal context.