Michigan operates the Michigan Medical Marihuana Program, administered by Cannabis Regulatory Agency, Michigan Department of Licensing and Regulatory Affairs.
Michigan approved medical cannabis by ballot initiative in November 2008, with the Michigan Medical Marihuana Act passing in every one of the state's 83 counties — a margin unmatched in any other state's medical cannabis vote. The statute retains its original spelling, "marihuana," in Michigan law. For its first eight years the program operated without any licensed commercial supply chain, relying entirely on patients and registered caregivers growing for a small number of patients each; that caregiver-centred structure remains unusually prominent in Michigan and is why the state has one of the largest registered caregiver populations in the country. The Medical Marihuana Facilities Licensing Act of 2016 added licensed provisioning centres, and voters legalised adult use in 2018. Oversight now sits with the Cannabis Regulatory Agency.
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