I told him I thought it was caused by losing the baby and he insisted that had nothing at all to do with it. I knew for sure he was wrong, but he refused to even consider it. But there was more to it than that.
Her grandmother was clearly schizophrenic, and her mother was probably was too. Just a few months before this her mother told me she "hated" our first child because "she looks like you" (it was me she was referring to).
This was in 1986. 15 years later, in 2001, a woman name Andrea Yates murdered her five children and that was when psychiatrist first diagnosed severe "Post Partum Depression" as the cause of what led her to do that.
During those years in between I had pointed out that connection many times to psychiatrists and everyone of them told me I was wrong and they all loved to make the point that I didn't have the credentials to offer a diagnoses of cause. But what I did have that none of them had was real life experience watching my wife slide into schizophrenia.
Schizophrenia is genetic and stress is a trigger. It often doesn't show up until one is an adult. By that time almost anyone will have taken a puff of weed and if a doctor asks them "have you ever used marijuana" and they say "yes", in my experience it doesn't matter how often, using it just once, even years prior, is enough for them to associate cause and effect.
Truth is you can learn something from anyone if you listen to them. If you don't, you won't. What I learned is psychiatry is still pretty much bullshit and the medical profession still doesn't understand the causes or how to treat schizophrenia effectively. They manage it by giving those suffering with it drugs that are akin to turning their patients into slobbering "zombies" so they can manage them.