Purely anecdotal, of course, but everything I have ever seen confirms a very clear positive correlation between mental illness and all sorts of dabbling in various squishy 'spiritual' matters. I don't know which way the influence goes, but suspect both, really.
The strong version: I believe that if you encounter serious mental health issues, and you start seeking cure in this strange mumbo jumbo alt.reality, you will very likely never get well again.
[Typos edited]