The laws governing marijuana can be complicated and difficult to interpret. The most important point is that currently, the only way to obtain marijuana legally in Canada is to apply for an MMAR license  to use marijuana for medical purposes.
Marijuana legislation and regulation is handled within Health Canada by the Marihuana Medical Access Division . Health Canada allows patients “who are suffering from grave and debilitating illnesses” to possess marijuana for medical use. The Marihuana Medical Access Regulations (MMAR) only deal with the medical use of marijuana and are seperate from the issue of the legality of marijuana in general.
From Health Canada:
Marihuana for medical use should not be confused with the movement to legalize marihuana for general consumption. Health Canada does not advocate the legalization of marihuana. Marihuana remains an illegal and controlled substance, similar to other controlled products. Unlawful possession is a criminal offence.
For an overview of the Marihuana Medical Access Regulations and how they work, visit Fact Sheet – Medical Access To Marihuana  on the Health Canda website.
You can see the official regulations themselves on The Department of Justice  website.
For more information, you can always contact the Marihuana Medical Access Division  directly:Marihuana Medical Access Division
Drug Strategy and Controlled Substances Programme
Healthy Environments and Consumer Safety Branch
Address Locator 3503B