Þvert á móti. A USC study of 4,400 Internet users found that "adults apparently do not increase their risk for depression by using marijuana", and in fact show less self-reported symptoms of depression. -Wikipedia og varðandi geðrofin A 2005 meta analysis of available data which evaluated several hypotheses regarding the correlation of cannabis and psychosis found that there is no support for the hypothesis that cannabis can cause cases of psychosis which would not have occurred otherwise… -...