Although marijuana may be legal, it is increasingly recognized as dangerous for people with serious mental illness: including depression, bipolar disorder, schizoaffective disorder, and schizophrenia. While new research is constantly coming out, today there is strong data to suggest that those with SMI are at high risk for the negative effects of marijuana use including worsening of schizophrenia symptoms, worsening of mood, and even triggering of manic symptoms in bipolar disorder.