Define adverse psychological affects, because I am a chronic user and I'm fine.
Don't be obtuse. Not every chronic tobacco user gets lung cancer, just like not every chronic marijuana user is going to experience psychological affects.
Chronic marijuana use has been associated with anxiety, schizophrenia, bipolar disorders and depression.
According to this study
, THC may trigger psychosis by interfering with the brain's ability to distinguish between important and unimportant stimuli that constantly flood the various regions in the brain.
I personally, developed an anxiety disorder, (whether or not it was created by marijuana I have no way of proving) and would have massive panic attacks at least once a day, if not multiple times a day.
One thing that triggered my attacks was getting high. I had attacks while not high, but literally every time I would smoke I would have one. I started to mentally associate the feeling of dying (if you've ever had a real panic attack you know what I'm talking about) with the feeling of getting high from pot.
I subsequently haven't smoked pot for about 5 years, and I haven't had any attacks in about 3 years.
I don't necessarily believe that smoking weed caused my disorder, but it sure as fug didn't help it. I'm to the point now that my disorder has abated that I'm thinking about smoking again, because I used to really enjoy it. Make no mistake though - I was not your average user. I have three marijuana related felony convictions with 19 total felony charges. I used to smoke all day every day. I'm not some uninformed person on this topic.