I believe cannabis oil has been used in some instances but the longer term effects have yet to be adequately researched. There is a difference in prescribing treatment for someone who is in the terminal phase of an illness, and someone who is not. I'd happily take something if it would extend my life when all other options had been exhausted, and hang the possible consequences! But maybe not if my prognosis was pretty good in the first place. But for sure it is a very interesting and potentially rich field for further research and trials.