I'm sure the pharma companies have looked into this. No nicotine based therapeutic drugs for schizophrenia yet that I know about.
If you will forgive a brief vocabulary advisory, the term schizophrenic is often misused, though NOT in this post -- including by Ph.D. and M.D.'s in presentations! -- to mean "of two minds," as in split personality. This is an unknowingly cruel misrepresentation since people beset by schizophrenia are already facing a lot of rejection and misunderstanding. In any case, patients may experience auditory hallucinations (hear voices), confused thinking, and scrambled speech with chaotic imagery, but they are not two or more distinct personalities (multiple personality). So if you must use a mental illness image, say you are suffering from split personality on the subject. Or better yet, that serviceable old phrase, I'm of two minds. That'll do it.