While this may seem a silly arguement, you didn't see any bootleg long life light bulbs after the cartels stopped production, no pushers hawking them on streetcorners, the ban was 100% effective, nobody addicted to trying to save a buck on home lighting, no illegal bulb labs in neighbourhoods.
That tells me if the powers that be really wanted to elimanate illegal drugs they could do so seamlessly, they don't because they like things just the way they are.