Changes in cannabis potency and cannabis-related psychiatric harms: a 23-year ecological study in Denmark
Psychological Medicine May 4, 2026 Kristine Rømer Thomsen, B. Thylstrup, Morten Hesse et al.
Abstract Background In recent decades, the potency of cannabis resin increased globally, raising concerns, as higher potency has been associated with increased risk of psychiatric harms at the individual level. The aim here was to examine whether changes over time in the potency of seized cannabis resin samples were associated with psychiatric harms at the population level. Methods Data on...