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I’m not sure it has been specifically studied, but may have been.

I do believe peripherally it has in studies on responses to drugs elicited different types of experiences considered spiritual. The drugs electing “spiritual” experiences being the hallucinogens.

Similarly, studies indicating and advocating use of hallucinogens for psychotherapeutic reasons. Studies advocating use of LSD, MDMA, psilocybin or other hallucinogens to change behaviors, habits, psychopathologies have been constant for 50 years or so now.

The more “earthbound” highs from amphetamines, opiods, alcohol, depressants, etc... Have not been found to be life changing.

I'm not sure I understand. It seemed that you were making what appeared to be factual statements, but now it appears to be some theory you have come up with? Bye the way, Cannabis technically is psychoactive not an hallucinogen.

A few other things you might consider is that Opium causes dissociative hypnogogic hallucinations. Methamphetamine commonly causes users to suffer from paranoid delusions, and psychotic behavior not to mention that it ( along with amphetamine, cocaine, Dexedrine, Adderall (dextroamphetamine), Ritalin(methylphenidate) and even caffeine in sufficient doses) can cause sleep deprivation hallucinations which are far more severe than LSD, MDMA, and Psilocybin.

Further I suspect that there are many people due to their misuse of meth/amphetamine, alcohol, opiates etc that would consider their drug addiction "life changing".

Most of those people wouldn't even call cannabis a "real" drug.