The news changes words alot and can send across a completely different meaning, especially depending on the political views of that news network. How do they know how many grow-ops there are in Toronto? I bet it's something like more Toronto grow-ops have been busted than all of America THIS YEAR. Or there are more grow-ops per square mile than the states. Or it's just a bullshit statistic (my guess)

EDIT: Or they consider a grow-op like one plant in somebody's basement. I bet more people in Canada grow small crops to themselves than in the States if that's the case, but for more weed to be available in one city (within a country with like the smallest population:land ratio, not to mention) then in one of the world's most overpopulated country's, I just can't see it happening