Duration of abstinence from cannabis is positively associated with verbal learning performance: A systematic review and meta-analysis.

Based on available evidence, some amelioration of verbal learning limitations presumed to result from cannabis appear to resolve between 7 and 28 days of sustained abstinence. However, in the reviewed studies, years of regular use were inversely related to longer periods of abstinence and verbal learning performance, undermining a confident inference that abstinence alone has direct benefits to verbal learning and memory. (PsycINFO Database Record (c) 2020 APA, all rights reserved).