The answer to this is really easy. Go to any mental institution and get to know the patients. An institution where they are allowed out, but are still in an enclosed area. A majority of the patients will have had some sort of heavy drug use in their past. Sure, whats causation and whats correlation, but its pretty clear that drugs cause mental breaks.
How do I know this?
I have mental illness in my family and have spent considerable amounts of time at those facilities.
That's unfortunate. Yes, I think it is clear too, but to so many it isn't that I have to figure out where is the truth? What circumstances cause what? Is it worthwhile to really avoid all psychonauts given the path they are on? For the ones with positive experiences on the total other side of the spectrum that take them into the spiritual mumbo jumbo, is this worth listening to? Is there a functional difference between the path the microdosers are taking and the ones that use 1000ug occassionally (ie. after smart people's 2.5 year stint at Google are they all on the path to a mental hospital?)
So many questions.
Where is the medical journal that says your conclusion "vast majority of mental health patients have a self-reported history of drug use of these specific drugs". I guess it can't exist because its crazy people self reporting a variety of substances that even the user would have no idea what was actually given to them.
How do I know this?
I have mental illness in my family and have spent considerable amounts of time at those facilities.