The Reefer Madness crowd needs to dry their knickers:
‘“The connection may be due to the use of drugs triggering a serious mental illness. But it can also point to the fact that people who develop psychosis as a result of drug use have a greater vulnerability to schizophrenia as well,” say researchers Eline Borger Rognli and Jørgen Bramness.’
Got excited by the speculation part did you?