Overview
- The Addiction paper estimates thresholds at about 30 to 31 milligrams of THC per week for adolescents and about 40 to 41 milligrams for adults, expressed as six and eight 5 mg THC units respectively.
- In the CannTeen sample of 150 users, roughly 80 percent of adults consuming fewer than eight units showed no use disorder compared with about 30 percent among those above that level.
- Authors emphasize the figures are tools for communicating risk rather than definitive safety limits and reiterate that abstinence is the only fully risk‑free option.
- Experts caution that the study is small and partly relies on products with unknown THC content, calling for larger, more representative research before broad adoption.
- Implementation faces hurdles because consumers may not reliably know product potency, effects differ by consumption method, and the weekly thresholds do not address acute risks such as driving impairment.