Cannabis Impairs Source Memory

A controlled study (120 participants; 20–40 mg THC via vaporizer) found that even moderate acute cannabis intoxication increases false memories, reduces ability to identify whether information was seen as text or image (source memory), and harms prospective memory (remembering to do future tasks). These deficits occurred while participants were high and suggest everyday risks beyond intoxication‑period impairment. — Widespread adult cannabis use combined with source‑memory impairment could raise population‑level risks for misinformation susceptibility and for routine safety (medication adherence, task completion).