Some Doctors's groups are suggesting that they do not want the responsibility of being accountable to their patient regarding dosages, effects, drug interactions and risk/ benefits of cannabis once it is legalized. These doctors wish to not be the "gatekeepers for medical marijuana" once it is legally available for recreational use. They believe that the level of research on cannabis usage is far less than that of other medications that they are allowed to prescribe and therefor wish to wash themselves of any responsibility or liability.
http://www.cbc.ca/radio/quirks/doctors-group-wants-to-scrap-canada-s-medical-cannabis-program-1.4636810
http://www.cbc.ca/radio/quirks/doctors-group-wants-to-scrap-canada-s-medical-cannabis-program-1.4636810