I'm all for finding the medical benefits for "weed" minus the THC.
My wife works with and I volunteer with street and at-risk youth. Virtually 100% of them smoke weed or worse, most of them have dropped out of school or can't hold a job. Generally, overall lack of motivation is common, short term memory loss, anxiety, paranoia and other varied psychosis. No, this doesn't happen to everyone to it's worst degree and there are certainly other aspects than weed in play but it's important to acknowledge the ever present dirty underbelly.
The marijuana of today is a magnitude stronger than decades ago and often cut with dangerous additives, heavy metals etc. Which is why we have a slew of new "don't drive high" ads running everywhere up here and police are trying to figure out exactly how to deal with its pending legality for recreational use. Legalizing it to get a handle on purity is not so simple as utilizing government licensing and retailers since the black market and organized crime will always be there to under-cut prices.
In my opinion, it's also very dangerous to say "I've smoked for years with no problem" or "I have a buddy who's a productive lawyer and smokes weed all the time" as being the norm. Often, their spouses, children or employers would disagree and the long term effects may still be to come.
I'm not going to lay that entirely at the feet of weed and medical mj sans THC very likely has a place for pain management/nausea/palliative care (shrink tumors? absolutely) etc but I would never have it enter the conversation as a "cure-all" for anything.
Big pharma also has big issues so as I said, I'm all for finding the medical benefits for weed minus the THC or other more natural alternatives.