They have to pay the proper taxes here and there are very serious fines if they receive an abatement letter. There is something called "appellation" that I don't know very much about and a lot of the old mom 'n pop growers are being driven out of the business by agribiz/green rushers who treat product as if it didn't mean anything at all except yet another way to make yet more money.
So I wouldn't advise them to even try selling it; it's not like setting up a lemonade stand.
But for personal use, as long as they obey the law, grow their own, and use a bit of common sense about when and where to imbibe, they should be fine.
No public places for consumption yet other than one Bud & Breakfast, as far as I know, but that is likely to change in the very near future.