This is straight from the amendment made to our states constitution, and I feel like these parts SHOULD answer most of your questions:
"3. Definitions. Sec. 3. As used in this act:
(a) “Debilitating medical condition” means 1 or more of the following:
(1) Cancer, glaucoma, positive status for human immunodeficiency virus, acquired immune deficiency syndrome, hepatitis C, amyotrophic lateral sclerosis, Crohn’s disease, agitation of Alzheimer’s disease, nail patella, or the treatment of these conditions.
(2) A chronic or debilitating disease or medical condition or its treatment that produces 1 or more of the following: cachexia or wasting syndrome; severe and chronic pain; severe nausea; seizures, including but not limited to those characteristic of epilepsy; or severe and persistent muscle spasms, including but not limited to those characteristic of multiple sclerosis.
(3) Any other medical condition or its treatment approved by the department, as provided for in section 5(a)."
"5. Department to Promulgate Rules.
Sec. 5. (a) Not later than 120 days after the effective date of this act, the department shall promulgate rules pursuant to the administrative procedures act of 1969, 1969 PA 306, MCL 24.201 to 24.328, that govern the manner in which the department shall consider the addition of medical conditions or treatments to the list of debilitating medical conditions set forth in section 3(a) of this act. In promulgating rules, the department shall allow for petition by the public to include additional medical conditions and treatments. In considering such petitions, the department shall include public notice of, and an opportunity to comment in a public hearing upon, such petitions. The department shall, after hearing, approve or deny such petitions within 180 days of the submission of the petition. The approval or denial of such a petition shall be considered a final department action, subject to judicial review pursuant to the administrative procedures act of 1969, 1969 PA 306, MCL 24.201 to 24.328. Jurisdiction and venue for judicial review are vested in the circuit court for the county of Ingham."
Long story short, it will take the state of Michigan quite a bit of time to get to the point of California.
But we took our first step!