Moderate cannabis use may improve decision-making in bipolar disorder, study finds

A cross-sectional study of 87 participants, including healthy controls and individuals with bipolar disorder, found that bipolar patients who used cannabis moderately (about 4–24 times per week) showed better decision-making and functional skills—comparable to healthy non-users—whereas bipolar non-users tended to have deficits. In healthy adults, cannabis use impaired decision-making. Heavy use (25+ times/week) was linked to worse performance. The authors caution that the study shows association, not causation, and call for larger randomized trials to explore potential mechanisms (dopamine-related) and the balance of risks and benefits before clinical recommendations.