We did prohibition once already.

I wouldn’t discount that as being a possibility for weed.

We aren’t in the prohibition era though, things are different. That’s the point of legalizing weed now.

We already have tons of small businesses/ individual entrepreneurs selling weed (dealers).

The point of the “legalization and regulation” process is to make it prohibitive to sell legally and transfer the market into the hands of big businesses who can afford it.