Tuesday, December 1, 2009

Teens, Depression and Marijuana (the facts)

Marijuana and Depression.
Marijuana and Suicidal Thoughts.
Marijuana and Schizophrenia.

Do we have your attention? As parents and caregivers, you probably never thought you’d see marijuana associated with these mental health problems … but it is. New research is giving us better insight into the serious consequences of teen marijuana use, especially how it impacts mental health.

Today’s teens are smoking a more potent form of marijuana and starting use at increasingly younger ages during crucial brain development years. 1 There is plenty of evidence indicating the ways pot impedes, even changes, the mental health of adolescents. In fact, those changes in the brain are similar to those caused by cocaine, heroin and alcohol.2 The overall impact that pot has on the brain can have long term consequences, and it’s up to you to influence your teen’s life when it comes to drugs.


Weekly or more frequent use of marijuana can double a teen’s risk of depression and anxiety. 3 Teens who smoke marijuana when feeling depressed are also more likely to become addicted to marijuana or other illicit drugs. Eight percent of depressed teens abused or became dependent on marijuana during the year they experienced depression compared with only three percent of non-depressed teens.4

Teen girls are especially at risk. More girls than boys felt depressed in the course of a year and substance abuse can compound the problem. Daily use of marijuana among girls is associated with a fivefold increase in the odds of developing depression and anxiety.5

Suicidal Thoughts

Marijuana can also be linked to suicidal thoughts. A study based on data from the National Household Survey on Drug Abuse found that teenagers 12 to 17 who smoke marijuana weekly are three times more likely to have thoughts of committing suicide.6 The same study linked increased anxiety and panic attacks to past year marijuana use.7


Several studies have documented marijuana’s link with symptoms of schizophrenia and report that cannabis is an independent risk factor for schizophrenia. Heavy users of marijuana at age 18 increased their risk of schizophrenia later in life by six times.8

Further reports have found marijuana use increased the risk of developing schizophrenia among people with no prior history of a disorder, and that early use of marijuana (age 15 vs. age 18) increased the risk even more.9 In addition, youth with a personal or family history of schizophrenia are at an even greater risk of marijuana-induced psychosis.10

(In the next part learn why teens feel depresses, and the solution)

  1. El Sohly, M.A. University of Mississippi Potency Monitoring Project, 2004
  2. Marijuana: Facts Parents Need to Know, Revised, NIDA, November 1998
  3. Patton, GC et al. Cannabis use and mental health in young people: cohort study. British Medical Journal, 325:1195-1198, 2002.
  4. 2006 National Survey on Drug Use and Health, SAMHSA, 2007. Table 6.36B. http://www.oas.samhsa.gov/NSDUH/2k6nsduh/tabs/Sect6peTabs36to37.pdf
  5. Patton, G.Cet al. Cannabis use and mental health in young people: cohort study. BMJ 325, 1195-1198, 2002.
  6. Greenblatt, J. (1998), Adolescent self-reported behaviors and their association with marijuana use. National Household Survey on Drug Abuse, 1994-1996 SAMHSA
  7. Ibid.
  8. Andreasson, S. et al. Cannabis and schizophrenia: A longitudinal study of Swedish conscripts. Lancet, 26: 1483-1486, 1987
  9. Arseneault L., et al. Causal association between cannabis and psychosis: examination of the evidence. British Journal of Psychiatry, 184: 110-117, 2004
  10. van Os et al. (Dec. 2004) Prospective cohort study of cannabis use, predisposition for psychosis, and psychotic symptoms in young people, British Medical Journal, 330

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