My problem with medical marijuana is that it is smoked. I think we have the technology to refine the actual chemicals in marijuana that would be medically useful. The fact that people with marijuana prescriptions go and pick out what kind of marijuana they want renders it not a prescription.
A prescription should specify the actual medicine and dose. Marijuana prescriptions don't do that and are really problematic.
Marijuana prescriptions appear to be a way for people to get high when they want to.