If you want to learn more about the study, you can read the full article here:

Cannabis Use Disorder and Subsequent Risk of Psychotic and Nonpsychotic Unipolar Depression and Bipolar Disorder

If you want to learn more about cannabis use disorder, you can visit these websites:

National Institute on Drug Abuse: Marijuana

World Health Organization: Cannabis

If you want to learn more about bipolar disorder and unipolar depression, you can visit these websites:

National Institute of Mental Health: Bipolar Disorder

National Institute of Mental Health: Depression