One of my ex' father triggered a lifelong episode of schyzophrenia by excessive drinking during mandatory military service around age 18-19. So i'd say there are number of triggers
Alternate theory; schizophrenia tends to manifest in men between 18 and 22. The drinking was him self medicating because of symptoms he was experiencing?
Final thesis: schizophrenia was starting to manifest and the drinking was him self medicating, not knowing it was making the schizophrenia worse and causing further harm.
