The pot industry exists and has existed for some time. Currently what is happening is highly fragmented tax-paying American outfits are replacing Mexican cartels as the production source, so that's at least a Good Thing. Even if it was legalized at the Federal level I'm not sure we would see a big-tobacco approach to growing pot.

Keep in mind this article is talking about growth of the state-legal pot industry, not growth of the overall pot industry (legal or otherwise) which I think must be growing, but more like at single digit percentage rates.