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The parent said “probably”, while you misrepresent them suggesting they made a bold statement dealing with a absolutes.

"probably does" mixed with the phrase "permanent negative" does indeed make it a bold statement.

If the comment had said "may or may not cause damage", that's a different thing. But the resulting phrase "probably causes permanent brain damage" is definitely a loaded statement to not back up with evidence.

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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