Medical Cannabis Users Preferred Higher-THC, Higher-Humidity Product in Quality Assessment Trial

A small crossover trial of 8 medical cannabis users with chronic pain found they could distinguish between preparations and preferred the product with highest THC (12%), highest humidity (14%), and largest grind size.

Ware, Mark A et al.·Harm reduction journal·2006·Preliminary EvidenceRandomized Controlled Trial

Medical Cannabis (1546)Harm Reduction (776)

Quick Facts

Study Type

Randomized Controlled Trial

Evidence

Preliminary Evidence

Sample

Not reported

What This Study Found

Eight experienced and authorized medical cannabis users with chronic pain evaluated four different herbal cannabis preparations varied by grind size, THC content, and humidity in a randomized crossover trial at a licensed clinical facility.

Seven subjects completed the study. The product rated highest overall had the highest THC content (12%), highest humidity (14%), and largest grind size (10 mm). Significant differences were noted between preparations on overall appearance and color (P = 0.003).

Participants evaluated products on appearance criteria (smell, color, humidity, grind size, ease of preparation, overall appearance) and smoking characteristics (burn rate, hotness, harshness, taste).

Key Numbers

8 medical cannabis users. 7 completed. 4 preparations varied by THC (up to 12%), humidity (up to 14%), and grind size (up to 10 mm). Significant differences on overall appearance and color (P = 0.003). Preferred product: highest THC, humidity, and grind size.

How They Did This

Randomized controlled crossover trial of 4 different herbal cannabis preparations. 8 experienced medical cannabis users with chronic pain. Products varied in grind size, THC content, and humidity. Evaluation using 5-point Likert scales for appearance and smoking characteristics.

Why This Research Matters

Valid clinical trials of herbal cannabis require products that patients will actually use consistently. Understanding patient preferences for product characteristics helps researchers design studies with better adherence and more reliable results.

The Bigger Picture

As medical cannabis research has expanded, product standardization and patient acceptability have become increasingly important. This study was among the first to systematically evaluate patient preferences for herbal cannabis characteristics, informing subsequent clinical trial design.

What This Study Doesn't Tell Us

Very small sample (8 patients, 7 completers). Results may not generalize to inexperienced cannabis users. Only smoked cannabis was evaluated. Product preference may reflect THC content preference rather than other physical characteristics. The number of preparations (4) was limited.

Questions This Raises

?Would product preferences differ for non-smoked cannabis preparations?
?Does product acceptability affect treatment outcomes in clinical trials?

Trust & Context

Key Stat:: Medical cannabis users preferred the product with highest THC (12%), highest humidity (14%), and largest grind
Evidence Grade:: Randomized crossover trial but very small sample size (7 completers). Provides useful pilot data for clinical trial design.
Study Age:: Published in 2006. Medical cannabis product standardization has advanced considerably, with many more preparations now available.
Original Title:: Evaluation of herbal cannabis characteristics by medical users: a randomized trial.
Published In:: Harm reduction journal, 3, 32 (2006)
Authors:: Ware, Mark A(14), Ducruet, Thierry, Robinson, Ann R
Database ID:: RTHC-00253

Evidence Hierarchy

Meta-Analysis / Systematic Review

Randomized Controlled TrialGold standard for testing treatments

This study

Cohort / Case-Control

Cross-Sectional / Observational

Case Report / Animal Study

Participants are randomly assigned to treatment or placebo groups to test cause and effect.

What do these levels mean? →

Frequently Asked Questions

Can medical cannabis users tell the difference between products?

Yes. In this study, experienced medical cannabis users could distinguish between preparations and had clear preferences. They rated products significantly differently on appearance and color, and preferred the product with highest THC content, humidity, and grind size.

Why does product quality matter for medical cannabis research?

If patients in clinical trials do not find the cannabis product acceptable, they may not use it consistently, leading to poor adherence and unreliable results. Understanding patient preferences helps researchers design studies with better participation and more valid outcomes.

Cite This Study

RTHC-00253·https://rethinkthc.com/research/RTHC-00253

APA

Ware, Mark A; Ducruet, Thierry; Robinson, Ann R. (2006). Evaluation of herbal cannabis characteristics by medical users: a randomized trial.. Harm reduction journal, 3, 32.

MLA

Ware, Mark A, et al. "Evaluation of herbal cannabis characteristics by medical users: a randomized trial.." Harm reduction journal, 2006.

RethinkTHC

RethinkTHC Research Database. "Evaluation of herbal cannabis characteristics by medical use..." RTHC-00253. Retrieved from https://rethinkthc.com/research/ware-2006-evaluation-of-herbal-cannabis

Access the Original Study

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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.

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