I thought about posting the study only, but the CNN article has two links (the one you mention and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037578/ https:/

I thought about posting the study only, but the CNN article has two links (the one you mention and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037578/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037578/) and also some comments by researchers, so I desided to post the article. From the nih.gov publication: > Cannabis appears to continue to exert impairing effects in executive functions even after 3 weeks of abstinence and beyond. While basic attentional and working memory abilities are largely restored, the most enduring and detectable deficits are seen in decision-making, concept formation and planning.