I have a similar situation with my own brother- skipping over many details for brevity. What I've always wondered was whether the marijuana caused the mental il

I have a similar situation with my own brother- skipping over many details for brevity. What I've always wondered was whether the marijuana caused the mental illness or whether the mental issues developing lead to a dependence on the marijuana to cope with the stress, anxiety, etc. Sure, there is a correlation there, but how certain are we which causes which? Then again, psychotropic drugs when you're already dealing with problematic brain chemistry probably isn't a great idea for anyone.