11/01/2013 21:19 EDT | Updated 01/23/2014 18:58 EST

Canada's changing medical marijuana system

Health Canada is set to turn its medical marijuana policy on its head next spring, when it moves from patient-grown pot to an industry run by large commercial producers.

Doctors and patients are among those opposed to it, but entrepreneurs are rushing to get a piece of what's expected to be a billion dollar business.

CBC's Nick Purdon takes a look at the high stakes for the industry's main players.