The medical cannabis argument is simply a first stage to decriminalization of marijuana.
My brother (a former drug and alcohol councilor) had a huge hard on about dope and used to quote studies and the like about the harm it did.
Now I'm not my brother and I don't have access to that info so when you all come crawling out of the woodwork demanding it I'm not going to be able to supply but the one thing I do know is it exists and the harm done by THC is NOT fictional.
And as its the THC component the legalise by stealth actually want I'm not really interested.
I don't believe there is any other agenda and call BS on the fact that for some people other available pain relief doesn't work.