Strongly agreed, with one correction: black markets are driven by shortage. The role of addiction is in creating demand, and at the same time making authorities restrict access.

There is no thriving black market for antibiotics, because they are accessible when you need them (and most people need them very infrequently for a short duration). In contrast, I believe there is a black market for insulin in the US, and that's because of how ridiculously expensive it is. Exuberant pricing is a form of restricting access, too.