A Note on Safety We built medicinal-use.com to help make sense of the UK’s changing laws, but we aren’t doctors. This content is for research and education—it isn’t medical advice. Before changing your healthcare routine or starting a new treatment, please speak with a GMC-registered clinician. Your safety matters more than any article we write.
On 12 January 2026, researchers from the University of Bath published groundbreaking guidelines in the journal Addiction, proposing a “THC unit” system—similar to alcohol units—to help people monitor cannabis consumption and reduce risks.
The key idea: One THC unit = 5 mg of THC. Experts recommend adults stay below 8 THC units per week (≈40 mg THC total) to minimize risks. Above this level, the chance of developing cannabis use disorder (CUD) increases noticeably. Risks for moderate-to-severe CUD rise more sharply past 13 units per week.
This is drawn from real-world user data (including cohorts like CannTeen), as cannabis potency continues to rise. The aim: provide clearer, evidence-based harm-reduction advice.
Lead researcher Dr Rachel Lees Thorne said: “The ultimate goal of our new guidelines is to reduce harm. The only truly safe level of cannabis use is no use. However, for those who don’t want to stop or are unable to, we still want to make it easier for them to lower their risk of harm.”
For UK medicinal cannabis patients (CBPMs): This remains a research proposal only—not prescribing law, NICE guidance, or adopted by the Medical Cannabis Clinicians Society (MCCS). Your specialist clinic will continue setting individualized doses based on your condition, tolerance, and needs (e.g., for chronic pain, anxiety, insomnia, migraines). Recent MCCS resources focus on safe titration, peer review for high-THC products (>25% or >2g flower/day), and balanced approaches.
That said, thinking in “THC units” could be a handy way to track intake and discuss patterns more precisely with your clinician. Never self-adjust doses—always follow your prescription and consult your GMC-registered specialist.
This could influence future patient education as more evidence emerges.
What do you think? Would THC units help with monitoring, or is it too general? Drop a comment below!
Sources (all dated 12 January 2026):
- Full study: Addiction journal – Estimating thresholds for risk of cannabis use disorder using standard delta-9-tetrahydrocannabinol (THC) units (DOI: 10.1111/add.70263)
- University of Bath announcement: Like alcohol units, but for cannabis—experts define safer limits
- Coverage: Medical Xpress, EurekAlert, and related reports confirming the details.