I used to on and off in the past, but I found it made me more prone to mania, so I've since stopped. Why do you ask?

Stimulant induced psychosis is very common. One of the major side effects of those medications, just like their street cousin, is paranoia.

I don’t really believe in the dormant/latent argument because once you shift down to the underground (as in, entertain all possibilities, even the possibility that you share something in common with drug abusers) where people abuse drugs, there you can see just how common psychosis is.

The drugs fuck people up. Interestingly, after many years of laying of the substance, many do find their way out of the psychosis.

I can't say I've experienced psychosis due to stimulant use personally, but I see what you mean. For me it's maybe brought on instances of hypomania a few times, but I get how it could trigger issues in others, especially in high doses.

My instances of psychosis outside of depression/mania tend to be triggered by stress. I don't use drugs or take any stimulant medications, but they still just happen sometimes. It sucks. I'm thankfully not in an active episode at the moment, but I do suffer on a daily basis from the "negative" symptoms of schizoaffective disorder (i.e., the symptoms that take away function, like anhedonia, avolition, alogia, etc).