Inside Washington's Legal Cannabis Market: Extracts Took Over, Prices Fell, and THC Per Dollar Soared
Analyzing 110 million transactions, extracts grew to 28.5% of Washington's legal cannabis sales by 2017, prices per gram of THC fell steadily, and high-potency 'dabs' dominated the concentrate market.
Quick Facts
What This Study Found
This study analyzed the largest legal cannabis dataset available at the time: over 110 million retail transactions in Washington State from July 2014 to October 2017. The headline trend was the rapid rise of extracts and concentrates, which grew from a small fraction to 28.5% of all sales.
Within the extract category, nearly half were identified as "dabs" — highly concentrated products typically consumed through specialized rigs. Another large segment was vape cartridges. These products delivered far more THC per dollar than herbal cannabis, and their market share was growing while herbal cannabis declined.
Prices per gram of THC fell across all product categories over the study period. The combination of falling prices and rising potency meant consumers could access dramatically more THC for less money with each passing year. Edibles showed a different pattern: lower THC per unit but higher price per THC milligram, suggesting consumers paid a premium for convenience and precise dosing.
Key Numbers
- 110+ million retail transactions analyzed (July 2014 – October 2017)
- Extracts: 28.5% of sales by October 2017
- ~50% of categorized extracts were dabs
- Price per gram of THC: falling across all product categories
- Herbal cannabis market share: declining as concentrates grew
How They Did This
Analysis of administrative data from Washington's recreational cannabis market: 110+ million retail item-transactions from July 2014 to October 2017. Applied text-analytic methods to product names and descriptions to estimate edible potency and identify extract subtypes. Tracked trends in THC, CBD, pricing, and market share across product categories.
Why This Research Matters
This paper documented in real transactional data what the potency studies measured in seized samples: the legal market was making THC cheaper and more concentrated. But it added the consumer choice dimension. People weren't just buying stronger weed — they were actively shifting toward extracts and concentrates, products that deliver THC at concentrations far above any flower.
The public health implications follow from basic economics: when a psychoactive substance becomes simultaneously more potent and cheaper, consumption typically increases. Washington's data showed this pattern playing out in real time in a legal, regulated market.
The Bigger Picture
Washington was one of the first legal recreational markets, making this data an early look at where legal cannabis markets head. The pattern — toward extracts, toward higher potency, toward lower cost per THC — has since repeated in Colorado, Oregon, California, and other legal states. This isn't a Washington anomaly; it appears to be what legal cannabis markets do without potency regulation.
What This Study Doesn't Tell Us
Washington-specific data may not generalize to other states with different regulations. Product labeling was inconsistent, requiring text analysis that introduces classification error. Cannot track individual consumer behavior — only aggregate transactions. THC testing accuracy varied across labs during this period. No health outcome data attached to purchasing patterns.
Questions This Raises
- ?Does the shift toward concentrates change the risk profile of cannabis use at the population level?
- ?Would potency-based taxation slow the trend toward higher-THC products?
- ?Are consumers choosing concentrates for efficiency, or because tolerance drives them to seek stronger products?
Trust & Context
- Key Stat:
- 110M+ Retail transactions analyzed in Washington's legal cannabis market
- Evidence Grade:
- Large-scale market analysis with comprehensive transaction data. Strong for documenting market trends, not designed to assess health outcomes.
- Study Age:
- Published in 2021 with data through October 2017. Washington's market has continued evolving, and similar patterns have emerged in other legal states.
- Original Title:
- Price and product variation in Washington's recreational cannabis market.
- Published In:
- The International journal on drug policy, 91, 102547 (2021) — The International Journal on Drug Policy is a reputable journal focusing on drug policy research and its implications.
- Authors:
- Davenport, Steven(2)
- Database ID:
- RTHC-03088
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
What are people actually buying in legal cannabis stores?
Herbal cannabis still dominates but its share is shrinking. Extracts and concentrates grew to 28.5% of sales, with dabs and vape cartridges leading. Edibles are smaller but growing.
Is legal cannabis getting cheaper?
Yes, per milligram of THC. Prices fell steadily across all product categories from 2014 to 2017. Consumers got more THC for less money each year.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03088APA
Davenport, Steven. (2021). Price and product variation in Washington's recreational cannabis market.. The International journal on drug policy, 91, 102547. https://doi.org/10.1016/j.drugpo.2019.08.004
MLA
Davenport, Steven. "Price and product variation in Washington's recreational cannabis market.." The International journal on drug policy, 2021. https://doi.org/10.1016/j.drugpo.2019.08.004
RethinkTHC
RethinkTHC Research Database. "Price and product variation in Washington's recreational can..." RTHC-03088. Retrieved from https://rethinkthc.com/research/davenport-2021-price-and-product-variation
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.