According to the WHO, Canadians are among the highest users of pot in the world. 
According to the Center for Addiction "in 2005, just over one-quarter (26.5%) of Ontario students (grades 7–12) said they had used marijuana in the past year, and one-third (31%) reported trying it at least once in their lifetime ... By the time they have reached Grade 12, nearly half (46%) of Ontario students have used marijuana in the past year." 
 The argument that legalizing pot for adults will make it more available to children is ridiculous. Clearly, it already is readily available despite the fact that it is illegal. Most of the money now goes to organized crime, who could care less what is in the stuff Canadians smoke. 
I would rather  the government monitor the business than the Hells Angels.
And I don't like seeing any Canadian tossed into jail or fined and the getting a criminal record for smoking a joint. It's insane.