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I assume you are arguing THC does not cause long term effects on the brain (not nicotine does)

It's not hard to find many journal articles that conclude it might -

DOI: 10.3233/JAD-160833 or https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6182105/

What journal articles conclude it might not?

That would change my opinion to "may or may not cause damage"

Sources for the long term effects on the brain mentioned in the above journal quote the following "While changes in the hippocampus and parahippocampus were frequently identified, the findings were inconsistent across studies."

And the above journal also makes an effort to mention how "low to moderate quality" the data is.

For what is the world's most popular recreational drug, it's astonishing to see the lack of research committed.

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