My current understanding of the medical science here is that the 'miracle cure' form of cannabis is only when prepared freshly juiced from raw living material. The THC (psychoactive component) remains unactivated, and the CBD (non-psychoactive but highly beneficial according to research) comes through to do it's thing without affecting the psychological state of the user, so far as is known.
Of course, even in that form, it is something that is illegal in most places, and so of course none of these things are recommended for anybody to try period, but with the FDA recently approving big pharma with the green light to make new drugs out of the stuff, I suspect there will be a lot of news on this topic in the near future.
Here is one interesting article on the topic carried by SOTT awhile back:
Juicing rare and unavailable strains of cannabis shown to benefit health