For years, cannabis has been a counter-cultural symbol-a plant that can be grown almost anywhere, giving it little marketing potential. That's about to change.

At a show last summer, a musician friend said to me, "This is Pineapple Express-I bought it legally in Kensington Market." Legal. Weed. Kensington. Toronto. That stuck in the memory banks, and I followed up next time I was in Toronto, visiting several locations of one well-reputed dispensary, sampling as many marijuana strains and concentrates as my budget would afford.

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