Interesting review these days at Science News on the status of cannabis as actual medicine, not just to alleviate symptoms, which is in itself a medical use, but also to cure a range of illnesses from post-traumatic disorder to even cancer.
Take a look.
Also interesting some of the comments. For example, Will protests that the interest of pharmaceutical companies are hindering legalizing the plant because they would rather make profit from its components, which they have patented.
Of interest as well is the alternatives mentioned to the usual smoking. Eating pills is probably a poor alternative because one cannot control the unavoidable high, but sprays, essential oils and even relays to heat the plant without burning it, delivering similar amounts of its essences, are mentioned.
Additional resources: Erowid.