Edible and flower cannabis users showed similar intoxication and memory impairment despite different blood THC levels
In a naturalistic study of 84 legal-market cannabis users, flower users had higher blood THC levels but similar THC metabolite levels, subjective intoxication, and verbal memory impairment compared to edible users.
Quick Facts
What This Study Found
Flower users consumed an average of 51.25 mg THC vs. 15.97 mg for edible users. Plasma THC was significantly higher after flower use, but THC metabolite levels, subjective intoxication, and verbal memory impairment were comparable between groups. Self-reported THC consumed correlated strongly with plasma THC for edible but not flower users.
Key Numbers
84 participants; flower users consumed 51.25 mg THC on average vs. 15.97 mg for edible users. Similar levels of intoxication and verbal memory impairment despite the dose difference.
How They Did This
Naturalistic study of 84 participants (55 flower, 29 edible users, mean age 32, 44% female) who used cannabis at least once weekly. Participants underwent blood draws, heart rate measurement, subjective drug effects assessment, and cognitive testing before and after ad libitum use of legal market products in a mobile laboratory.
Why This Research Matters
This is one of the first studies to directly compare the pharmacology and effects of legal market edible and flower cannabis under naturalistic conditions, providing data more relevant to real-world use than laboratory studies with standardized products.
The Bigger Picture
The finding that edible and flower users reach similar levels of impairment despite different doses and blood levels challenges simplistic dose-response assumptions and highlights the complexity of cannabis pharmacology across delivery methods.
What This Study Doesn't Tell Us
Non-randomized design (participants self-selected their product type). Unequal group sizes. Ad libitum dosing means results reflect typical use patterns rather than controlled comparisons. Single-session assessment.
Questions This Raises
- ?Why do edible users achieve similar impairment with lower doses?
- ?Does tolerance develop differently for each route?
- ?Could edible dosing guidelines be based on these naturalistic findings?
Trust & Context
- Key Stat:
- Similar impairment despite 3x dose difference between flower and edible users
- Evidence Grade:
- Novel naturalistic design with legal market products, but non-randomized and moderate sample size.
- Study Age:
- Published in 2022.
- Original Title:
- A naturalistic study of orally administered vs. inhaled legal market cannabis: cannabinoids exposure, intoxication, and impairment.
- Published In:
- Psychopharmacology, 239(2), 385-397 (2022)
- Authors:
- Bidwell, L Cinnamon(21), Karoly, Hollis C(8), Torres, Marco Ortiz, Master, Ashley, Bryan, Angela D, Hutchison, Kent E
- Database ID:
- RTHC-03712
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Do edibles and flower produce different levels of impairment?
In this study, despite flower users consuming about three times more THC (51 mg vs. 16 mg), both groups showed similar levels of subjective intoxication and verbal memory impairment after ad libitum use.
Why did edible users consume less THC but feel equally intoxicated?
Edible users may titrate their dose more effectively to reach their desired effect, or the metabolic pathway for oral THC (which produces the potent metabolite 11-OH-THC) may produce comparable effects at lower doses.
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Cite This Study
https://rethinkthc.com/research/RTHC-03712APA
Bidwell, L Cinnamon; Karoly, Hollis C; Torres, Marco Ortiz; Master, Ashley; Bryan, Angela D; Hutchison, Kent E. (2022). A naturalistic study of orally administered vs. inhaled legal market cannabis: cannabinoids exposure, intoxication, and impairment.. Psychopharmacology, 239(2), 385-397. https://doi.org/10.1007/s00213-021-06007-2
MLA
Bidwell, L Cinnamon, et al. "A naturalistic study of orally administered vs. inhaled legal market cannabis: cannabinoids exposure, intoxication, and impairment.." Psychopharmacology, 2022. https://doi.org/10.1007/s00213-021-06007-2
RethinkTHC
RethinkTHC Research Database. "A naturalistic study of orally administered vs. inhaled lega..." RTHC-03712. Retrieved from https://rethinkthc.com/research/bidwell-2022-a-naturalistic-study-of
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.