Australian Street Cannabis Averaged 12% THC With Almost No CBD, and Users Could Not Gauge Potency
Testing of 127 street cannabis samples in regional Australia found an average of 12% THC with negligible CBD, and users' perception of strength did not correlate with actual THC content.
Quick Facts
What This Study Found
One gram of Australian street cannabis contained an average of 34.8 mg THC (about 7 standard THC units) and 12% total THC with only 0.3% total CBD. THC concentrations were stable across participants' samples over time. Critically, users' subjective assessments of cannabis strength showed no correlation with the actual THC content of their products.
Key Numbers
37 participants, 127 samples. Average per gram: 34.8 mg THC (6.96 standard THC units), 12% total THC, 0.3% total CBD. THC stable across timepoints (p>0.05). No correlation between perceived strength and actual THC content (p>0.05).
How They Did This
Participants donated two 1-gram cannabis samples at three timepoints approximately 9 weeks apart (6 samples total) over 5 months. High-performance liquid chromatography quantified concentrations of THC, CBD, and five other cannabinoids plus their acid precursors in 127 total samples from 37 participants.
Why This Research Matters
In unregulated markets, consumers have no reliable way to know what they are consuming. The finding that perceived strength does not match actual THC content means users cannot self-regulate their dosing based on experience alone.
The Bigger Picture
This is the first comprehensive analysis of Australian street cannabis potency in over a decade. The high THC-to-CBD ratio mirrors international trends toward high-potency, CBD-depleted cannabis, which has been linked to greater mental health risks.
What This Study Doesn't Tell Us
Convenience sample from one regional area of Australia. 37 participants may not represent all cannabis users. Street cannabis composition varies by region and source. Self-reported strength perception is subjective.
Questions This Raises
- ?Has Australian street cannabis potency increased since the last assessment over a decade ago?
- ?Would labeling requirements in regulated markets help consumers make safer choices?
- ?Does the near-absence of CBD in street cannabis increase health risks?
Trust & Context
- Key Stat:
- Users' perceived strength showed zero correlation with actual THC content
- Evidence Grade:
- Moderate: objective chemical analysis with repeated sampling over time, though limited by small regional convenience sample.
- Study Age:
- 2025 study.
- Original Title:
- Cannabis in the wild: Analysis of street cannabis and cannabinoid composition in Australia.
- Published In:
- The International journal on drug policy, 145, 104974 (2025)
- Authors:
- Lorenzetti, Valentina(15), Goodwin, Isabella(4), Christensen, Erynn(2), Kirkham, Rebecca, Chye, Yann, Galettis, Peter, Gordon, Rebecca, Solowij, Nadia, Yücel, Murat
- Database ID:
- RTHC-06985
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Can you tell how strong cannabis is by using it?
This study suggests not. Users' subjective assessment of strength had no correlation with the measured THC content, meaning experience alone is not a reliable guide to potency.
Is street cannabis getting stronger in Australia?
At 12% average THC, levels appear to have increased compared to reports from over a decade ago, though they are lower than some international averages. CBD levels remain very low.
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Cite This Study
https://rethinkthc.com/research/RTHC-06985APA
Lorenzetti, Valentina; Goodwin, Isabella; Christensen, Erynn; Kirkham, Rebecca; Chye, Yann; Galettis, Peter; Gordon, Rebecca; Solowij, Nadia; Yücel, Murat. (2025). Cannabis in the wild: Analysis of street cannabis and cannabinoid composition in Australia.. The International journal on drug policy, 145, 104974. https://doi.org/10.1016/j.drugpo.2025.104974
MLA
Lorenzetti, Valentina, et al. "Cannabis in the wild: Analysis of street cannabis and cannabinoid composition in Australia.." The International journal on drug policy, 2025. https://doi.org/10.1016/j.drugpo.2025.104974
RethinkTHC
RethinkTHC Research Database. "Cannabis in the wild: Analysis of street cannabis and cannab..." RTHC-06985. Retrieved from https://rethinkthc.com/research/lorenzetti-2025-cannabis-in-the-wild
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.