I've posted more evidence than you have. Whether that concerns you is of course up to you.
You only tried one search term, which gave a meager set of 12 search results. Plus, since the database is the one that medical researchers use, sometimes the condition you are looking for is not necessarily described in terms that a lay person would recognize as relevant.
However, when I chose a different term, one more likely to be used by researchers—”marijuana brain damage”—I had 118 results. Among them are the following:
—https://www.ncbi.nlm.nih.gov/pubmed/28614161, “Multiple Cerebral Infarcts in a Young Patient Associated With Marijuana Use.”
—https://www.ncbi.nlm.nih.gov/pubmed/28557129, “Recreational stimulants, herbal, and spice cannabis: The core psychobiological processes that underlie their damaging effects.”
—https://www.ncbi.nlm.nih.gov/pubmed/27224247, “Grey Matter Changes Associated with Heavy Cannabis Use: A Longitudinal sMRI Study.”
—https://www.ncbi.nlm.nih.gov/pubmed/26849855, “Psychosis following traumatic brain injury and cannabis use in late adolescence.”
These articles are all pretty damning as far as effects of marijuana go. Furthermore, that was just one search term. There are over 26,000 results from searching “marijuana” with no modifiers—and so far, it doesn’t look good for those who insist that marijuana use is harmless.
I commend you for actually going to the source and looking for yourself. Telling you to check PubMed is not the same as telling you to search Google; PubMed is *the* catalog used by medical researchers all over the world to stay current with medical issues.
If you find an article that you would like me to explain in plain language, feel free to ask me.