And now it is bad drugs.. AFAIK the argument against most environmental factors was that schizophrenia frequency seems similar globally after accounting for ways societies handle cases.
Given the ethical limitations on this kind of research, I think a research group that wants to talk about probable causation really needs a cross cultural method to randomly sample and demonstrate active case prevalence changes and to run that sampling over many years.
Given the ethical limitations on this kind of research, I think a research group that wants to talk about probable causation really needs a cross cultural method to randomly sample and demonstrate active case prevalence changes and to run that sampling over many years.