Earlier quoted context omitted.
No, but you did essentially shoot down someone else's statement about what led to their growth. You can't have it both ways. You can't shoot them down and assert they are wrong because your experience disagrees with it, then say it is all just opinion, man. Either respect their opinion about their own life experience or defend your assertion that they are wrong with something stronger than personal opinion.
I take your point. I did not intend to shoot them down or suggest that his personal growth was imaginary. However, I think you missed the main point of my post, which was to suggest that perhaps there was a comorbid reason for his perceived cognitive deficiencies that were not a direct result of marijuana, but related to known side effects, such as REM sleep disruption. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC46…
It sounds like you feel personally threatened and you feel some need to shoot down the well established scientific fact that drugs impair cognitive function.
There may be more going on in his life than marijuana impairing cognitive function, but you have absolutely no basis whatsoever to assert that they are wrong about their own life and there is some other explanation for the cognitive effects they experienced.