Maybe, but the real issue is that anyone is allowed to grow the stuff. And it is really easy to grow. So everyone knows somebody who is growing. Why pay commercial prices when your neighbor can provide you the same quality at a fraction the cost? It may be a "black" market in the sense that it isn't the regulated market, but those who smoke the stuff see little difference between buying a neighbor's pot and buying carrots. They both come from the same garden.
https://aglc.ca/cannabis/using-cannabis-responsibly/growing-...