Has, the legalization of recreational marijuana, prevented much of the illegal drug deals in the legalized states?

The legalization of recreational marijuana has definitely impacted the cannabis black market. New Frontier Data published a slide that indicated that ilicit sales have dropped to 33% of the overall cannabis market in Colorado, with Oregon at 39%, Washington at 51% and California at 71%. As these markets mature and state and local regulations are implemented in California, these numbers will continue to drop. Most people would prefer to buy their cannabis from a legal, reliable source.