They're quite wrong about that. Marijuana is not even a hallucinogen like LSD.
Long term use.
I'm highly skeptical that even long term use of marijuana does "psychotic, LSD-like damage." What are the exact words your progressive liberal textbooks use on this subject?
“With higher doses and with certain unstable or susceptible individuals, marijuana can produce extreme euphoria, hilarity, and overtalkativeness, but it can also produce intense anxiety and depression as well as delusions, hallucination, and other psychotic-like experiences. Evidenced suggests a strong relationship between daily marijuana use and the occurrence of psychotic symptoms (Raphael et al., 2005 = Comorbidity: Cannabis and complexity. J. Psychiat. Pract., 11(3), 161-76.)
Text: Butcher, J.N., Mineka, S., Hooley, J, Abnormal Psych 14th edition.
Most users wouldn’t have this reaction, however, most people are responsible gun users.