"I'm sure you'll be very happy to learn that the ASI fully supports your right to ingest any and every substance you should wish to. Yes, we argue very strongly (as I do individually) for the full legalisation of all narcotics. 'Coz we're liberals, see?"
Quite frankly my dear I don't give a damn....
I think you'll find that such views are 'Libertarian' rather than 'Liberal', but that's just nit-picking.
More to the point your "support" for liberalising the laws merely confirms that there is currently a constraint. As the Afghani farmers or Columbian Coke growers have discovered no matter how profitable (or merely capable of sustaining subsistance) a crop can be, when someone with a big gun says "No" (or "yes") it pays to obey, seriously screwing the free market! Of course the Real World is full of people with both pysical and metaphorical big guns who have absolutely no investment in absolutist market economics.