Can medical cannabis oil cure serious diseases like cancer?

The medical value of cannabis has been hotly debated for years. Its use as a relaxant or a pain reliever is widely accepted now.
 
 Alastair Leithead reports from California.

But can cannabis do more than just treat symptoms of disease. Can it actually help cure serious illnesses, such as cancer?

view his report: http://www.bbc.co.uk/news/world-32020114