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Re:When Adolescents Give Up Pot, Their Cognition Quickly Imp... by apsec112 on Wednesday October 31, 2018 @11:02AM (#18346245)
"Permanent" implies that you'd have to look at people who did pot a while ago and then stopped. This data (and any data on current users) is consistent with the alternative hypothesis that the changes are temporary and will revert after ceasing use.
Re:When Adolescents Give Up Pot, Their Cognition Quickly Imp... by IMTDb on Wednesday October 31, 2018 @12:32PM (#18347125)
Long lasting effects are harder to study obviously, but here is one that confirms that there are long term consequences:

https://www.nature.com/articles/npp201744