Research Paper (postgraduate) from the year 2011 in the subject Psychology - Clinical Psychology, Psychopathology, Prevention, grade: 4.0, Michigan State University, language: English, abstract: This paper explores the long term effect of cannabis on mental health. These studies prove a clear correlation between cannabis use and mental health disorders, however, none of the them conclude that cannabis is the sole cause of the development of the disorders. such as, schizophrenia, bi-polar disorder and depression. Keywords: Delta-9-tetrahydrocannabinol (?9-THC), Cannabidiol (CBN), Cannabinol (CBC), schizophrenia, depression, bi-polar disorder