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If you think marijuana is harmless, think again. A new study shows it can have powerful mental health side effects.

In the movies and among many teens and college students, the perception is that pot is relatively harmless. It mellows you out and the worst side effect is a bad case of the munchies, right? Not according to a new study. An article published in the latest issue of the professional journal Archives of General Psychiatry shows a much scarier potential effect of marijuana. It turns out that a chemical called tetrahydrocannabinol (THC), found in pot, increases the brain processes that can lead to symptoms of psychosis.

So what does that mean for the average person? Can smoking pot lead to psychosis? Are there are other possible health concerns uncovered by this new study?

Previous research has found that THC can induce symptoms of psychosis in healthy people and worsen psychotic symptoms in people already experiencing them. Long-term cannabis use is also associated with an increased risk of schizophrenia, the study suggests.

The study is groundbreaking in another way: Its findings are the first to use images of the brain to demonstrate that the reason symptoms of psychosis arise in marijuana users may be because THC interferes with the brain’s ability to distinguish between stimuli that are important, and those that aren’t, according to the study. (more…)