I disagree. I think the cartels or some large agro businesses would set up huge farms just like tobacco farms. I'm fairly certain it's perfectly legal to grow tobacco in your backyard, but no on does because it's so much cheaper and easier to buy it from a farm.

So those people with expertise in growing it would continue to do so but out in the open in huge farms and profits would plummet to near at-cost production levels as they compete with similar large farms.