I said a long time ago that legalizing marijuana wasn't going to stop people from getting it illegally, or stop crime associated with it. And like you, I don't buy into that medicinal benefits crap either.
There is one and only one medicinal value for cannabis. Chemo/Chronic nausea.
Cannabis works remarkably well for this. It’s impossible to use anti nausea medication when you’re heaving your guts out, you cannot keep it down long enough for the meds to be absorbed.
The delivery method doesn’t require you to put something into your stomach while it’s under duress.
There’s no other valid medicinal use regardless of what the advocates say. However, there’s nothing that works faster and as effectively as a single puff of cannabis to relieve the nausea from chemo or other life saving medications.