A study by researchers at McGill University has been looking into the effects of smoking cannabis on teenagers. The study found that smoking cannabis on a daily basis can lead to depression and anxiety. Cannabis was found to lead to a decrease in serotonin transmission, which can lead to mood disorders, and an increase in norepinephrine transmission which leads to a greater long-term susceptibility to stress.
You can find out more about this research at
http://psychcentral.com/news/2009/12/18/marijuana-tough-on-teenage-brain/10288.html
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