At first, the cartels switched to focusing on heroin. They thought their illegal pot would not be wanted after legalization. Now they know they will be able to undercut prices - no taxes.
Illegal pot is going nuts. And it will be neurotoxic with those chemicals.
But all the underclass illegals or poor kids will buy the cheapest weed. Good plants will be expensive. So the cartels are happily growing more weed.
Whereas before legalization EVERY pot user bought the criminals' weed. More winning!