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" ... The study did have limitations. Aside from being a small study with a methodology unable to account for every factor that might influence the outcome, the researchers also noted that they can't be sure the results weren't caused by "the rapid changes in cerebral perfusion that are known to occur with a single dose of psychoactive drugs." In other words, they may have witnessed a short-term effect that won't last. Quoting from the study: "It is also unclear whether the effects of CBD will persist after longer-term dosing." ... "