Agreed on the marijuana is like grapefruit analogy.
Just don't think the actual practitioners of medicine- the doctors, nurses and the like- want to see marijuana stay illegal. Damn near all of them I've spoken to (all in Colorado, so they need not fear persecution for their opinions) said that the sooner it's legal the better!
They aren't big fans of dabs tho- it's tough on the lungs, and producing it is causing these same professionals to see a spike in burn victims- including innocent ones. They are NOT fans of that.
They'd really prefer to see their patients eat pot, and many here will say so on hospital letterhead. Makes getting an extended plant count easier than rolling a joint.