High Stakes: How Legal Cannabis Pricing Impacts the Illicit Market

Background Although nearly 80% of Americans reside in a county with a legal, regulated cannabis dispensary, the majority of cannabis consumed in the U.S. is still obtained from unregulated, illicit sources. Illicit cannabis carries greater health risks and is generally less preferred than regulated cannabis, yet its lower price makes it attractive to many customers. However, comparative research on price differentials between the legal and illicit markets across states is scarce. Establishing cannabis price benchmarks is essential to ensure that legal markets are competitively priced and can effectively displace the illicit trade. Methods We used crowdsourced data from PriceofWeed.com to estimate the cost of illicit cannabis in 2018–2024 and data from state government websites to estimate the cost of legal cannabis in Colorado, Oregon, California, Massachusetts, Michigan, Illinois, Maine, and Connecticut. We compared illicit prices by recreational dispensary status in all 50 states and D.C. and examined legal vs. illicit prices within the eight aforementioned recreational states. Results The median price per gram of illicit cannabis was significantly lower in recreational states, compared to non-recreational states ($7.10 vs. $8.90, p < 0.001). While illicit and legal prices were not significantly different over the entire study period, there were significant differences within years and within states. In Colorado, California, and Michigan, legal cannabis was significantly less expensive than illicit cannabis, while in Massachusetts, Illinois, Maine, and Connecticut, illicit cannabis was significantly less expensive than legal cannabis. Conclusions The presence of recreational dispensaries is associated with a decrease in illicit market prices. Recreational market maturity appears to determine whether legal or illicit cannabis is more expensive within a state, with states with older markets – all of which also had more flexible licensing policies – had a legal cannabis price advantage.