As matt notes, marijuana is still an illegal substance in Canada.
Cannabis and its derivatives are prescribed substances under Schedule II of the Controlled Drugs and Substances Act, S.C. 1996, c. 19. It is an offence to posses it (s. 4), traffick in it (s. 5), import/export it (s. 6), or produce it (s. 7).
However, last July the Ontario Court of Appeal (not the Supreme Court) has held that the failure to include an exception for medical use infringes the Charter’s guarantee of security of the person: R. v. Parker. I believe that case is on appeal to the Supreme Court, but I’m not sure.
That Ontario court decision has triggered an ongoing debate on the medicinal use of marijuana: Hopes for marijuana ignite controversy for widespread use, and a couple of months ago, the federal government issued a contract to a company to grow marijuana in a disused mine in Manitoba, so there would be consistent supply for medicinal exceptions and medical research (can’t find a link to that - sorry).
Also as matt mentioned, at the federal level, there is the Marijuana Party of Canada, which advocates the de-criminalization of marijuana.
See also: Canada’s Marijuana Party.