"In research that turns on its head previous thinking about links between schizophrenia and smoking, scientists say they have found that cigarettes may be a causal factor in the development of psychosis."
and
""While it's always hard to determine the direction of causality, our findings indicate that smoking should be taken seriously as a possible risk factor for developing psychosis," James MacCabe, a psychosis expert who co-led the research at King's College London's Institute of Psychiatry, told reporters."
http://www.reuters.com/article/2015/07/09/healthcare-smoking-schizophrenia-idUSL8N0ZP1TI20150709
Link broken, because I don't trust that any press release, or the articles I've seen on it, are reporting accurately on the research, which I haven't seen.
"News" ought to be about what IS or what IS NOT.
It happens so frequently nowadays that news reports waste our time reporting on "may be".
Whenever that happens I have to assume it's really a sponsored/lobbied propaganda piece.