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> Unfortunately not. If you spend a long time smoking you'll end up permanently slower in the brain.

I'm sorry, but what? You can't make claims like that without providing evidence to back it up.

Here you go: https://www.drugabuse.gov/news-events/nida-notes/2016/09/reg...

"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.

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

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