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This may be more suited to the ED, but I'll risk putting it here.

I'm going to go ahead and assume everyone knows what schizophrenia is. If you don't then look it up here: http://en.wikipedia.org/wiki/Schizophrenia

Usually schizoprenia simply appears. I'm not saying one day you're fine and the next you're being taught how to efficiently and silently kill a person by some disembodied voice who has rather selfishly decided to take up residence in your head. Rather, I mean at some point in your life you're fine, then you gradually become aware of random voices speaking to you. In any case, it's all a passive process; you have no control over the voices appearing.

Is it possible, however, to consciously strive towards creating a mental state resembling schizophrenia (in the sense that you make voices speaking of stuff that you're not really thinking about appear, etc)? And then, would it be possible to reverse the process and remove those voices?

LSD was originally developed by Albert Hoffman working for Sandoz (now Novartis) as a 'psychomimetic" or something that mimics psychosis. We don't call it that anymore, seeing as we understand schizophrenia better. The idea was that a psychiatrist could take LSD to gain a greater understanding of schizophrenia.

That said, no, I don't think there is a way to effectively induce a schizophrenic episode.

well couldn't they make themselves become in sense that they can well... "work" with their conscious to become that way? because its not that hard to condition themselves.