What? How did this go unnoticed. I am not (overly) skeptical of the claim, but the causes of schizophrenia have been so mysterious and smoking's negative affec

What? How did this go unnoticed. I am not (overly) skeptical of the claim, but the causes of schizophrenia have been so mysterious and smoking's negative affects on health so ubiquitous that I'm surprised that no connection was investigated earlier.