But the government really wants you to stop growing tobacco so much that it's willing to buy out your quota. On the other hand, it is illegal to grow hemp, period. And so there is no quota, and you can grow all you want if you don't mind going to prison. Obviously a lot of people don't mind. Kentucky has been estimated to be the fourth-largest producer of marijuana in the United States.
Nobody really knows who's producing the most.
For some reason, marijuana growers don't keep the best records from which to draw government statistics. It was legal to grow hemp in Kentucky in the 18th and 19th centuries. Then federal law made it illegal during the 20th century, then it became legal again during the World War II years, then illegal again after the war, and now there's a push to legalize it again. What a tangled tale. Tobacco is simpler.