Association of Cannabis With Cognitive Functioning in Adolescents and Young Adults: A Systematic Review and Meta-analysis

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“Question  Is frequent or heavy cannabis use associated with cognitive dysfunction in adolescents and young adults?

Findings  This systematic review and meta-analysis of 69 cross-sectional studies of 2152 cannabis users and 6575 comparison participants showed a small but significant overall effect size for reduced cognitive functioning in adolescents and young adults who reported frequent cannabis use. However, studies requiring abstinence from cannabis for longer than 72 hours had a very small, nonsignificant effect size.

Meaning  Although continued cannabis use may be associated with small reductions in cognitive functioning, results suggest that cognitive deficits are substantially diminished with abstinence.

Conclusions and Relevance  Associations between cannabis use and cognitive functioning in cross-sectional studies of adolescents and young adults are small and may be of questionable clinical importance for most individuals. Furthermore, abstinence of longer than 72 hours diminishes cognitive deficits associated with cannabis use. Although other outcomes (eg, psychosis) were not examined in the included studies, results indicate that previous studies of cannabis in youth may have overstated the magnitude and persistence of cognitive deficits associated with use.”

https://www.ncbi.nlm.nih.gov/pubmed/29710074

https://jamanetwork.com/journals/jamapsychiatry/article-abstract/2678214?redirect=true

“Cannabis harm to teenagers’ brains ‘overstated’, finds study”  https://www.independent.co.uk/news/health/cannabis-marijuana-legalisation-harm-brain-intelligence-development-mental-health-a8311126.html

“Weed doesn’t make stoners permanently slow – study”  http://www.newshub.co.nz/home/health/2018/04/weed-doesn-t-make-stoners-permanently-slow-study.html

“Marijuana’s effects on young brains diminish 72 hours after use, research says”  https://www.cnn.com/2018/04/18/health/marijuana-cognitive-effects-study/index.html

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