Standard THC Unit Could Help Quantify Cannabis Use and Cut Harm
A University of Bath–led CannTeen study proposes a standard THC unit to quantify cannabis potency, aiming to provide a metric similar to standard drinks. Analyzing 150 London users over 12 months, researchers found potency has risen and higher-THC cannabis is linked to greater risk of cannabis use disorder; they estimate a strong 0.45 g joint can contain about 12.8 THC units while a weaker variant may have ~3.8 units. They suggest adults should not exceed 8 THC units per week to reduce risk, a guideline welcomed by public health researchers, though cannabis contains many cannabinoids beyond THC. The study is published in Addiction.