By Tobias Carroll As legalizing recreational marijuana has gained more steam across the nation, a number of reasons why it makes sense to do so have been cited by proponents of the measures. Among them are the idea that legal weed can be taxed and used to fund various government projects, and the notion that regulating recreational marijuana can be a boost for local businesses. But there’s a complicating factor here — namely, just because weed is legal in a city or state now doesn’t mean there wasn’t a market for it before. Or, for that matter, plenty of sellers willing to risk the wrath of la…