Besides the sale of munchies, would MJ really be a tax boom to the state economy?

Lets say the state gives out permits for legal farmers who harvest, package, and send it to the state to be sold in liquor stores. But, why would I want to pay for something I could easily grow myself at home? I mean afterall, it is just a weed, not that hard to grow with knowledge that can be found on line and in a book. Certainly much easier to make then alcohol.

In order for the state to profit, the state would have to still criminalize the cultivation of MJ and I would suspect that the vast majority of smokers would still grow their own anyway, in which case there would still be a criminal penalty, plus tax evasion charges etc. The state would have to hire people to enforce and regulate MJ, creating a new state beuracracy.

Maybe I am wrong and everyone would flock to the liquor store to buy MJ and not bother with growing it. But, I bet there would still be a helluva black market, just because people are so accumstomed to buying MJ from a dealer and a whole structure is in place already to black market MJ, if it became legal. I just can't see the state not wanting to conrol everything and make sure every smoker has paid their tax.