Objective: Adolescents who regularly use marijuana may be at heightened risk of developing subclinical and clinical psychotic symptoms. However, this association could be explained by reverse causation or other factors. To address these limitations, the current study examined whether adolescents who engage in regular marijuana use exhibit a systematic increase in subclinical psychotic symptoms that persists during periods of sustained abstinence.
Method: The sample comprised 1,009 boys who were recruited in 1st and 7th grades. Self-reported frequency of marijuana use, subclinical psychotic symptoms, and several time-varying confounds (e.g., other substance use, internalizing/externalizing problems) were recorded annually from age 13 to 18. Fixed-effects (within-individual change) models examined whether adolescents exhibited an increase in their subclinical psychotic symptoms as a function of their recent and/or cumulative history of regular marijuana use and whether these effects were sustained following abstinence. Models controlled for all time-stable factors (default) and several time-varying covariates as potential confounds.
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The participant will identify factors suggesting that regular marijuana use may increase the risk that an adolescent will experience persistent subclinical psychotic symptoms.
This program is designed for all psychiatrists in clinical practice, residents in Graduate Medical Education programs, medical students interested in psychiatry, and other physicians who wish to advance their current knowledge of clinical medicine.
Estimated Time to Complete
Duration: 1 hour
Begin Date: August 1, 2016
End Date: July 31, 2018
How to Earn Credit
In order to earn CME credit, subscribers should read through the material presented in the article. After reading the article, complete the quiz and submit your evaluation and study hours (up to 1 AMA PRA Category 1 Credit™). A score of 60% or higher is required to receive credit.
The American Psychiatric Association (APA) is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.
The APA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 Credit™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.
Faculty and Planner Disclosures
Title: Concurrent and Sustained Cumulative Effects of Adolescent Marijuana Use on Subclinical Psychotic Symptoms
Authors: Jordan Bechtold, Ph.D., Alison Hipwell, Ph.D., David A. Lewis, M.D., Rolf Loeber, Ph.D., Dustin Pardini, Ph.D.
Affiliations: From the Department of Psychiatry, University of Pittsburgh Medical Center, Pittsburgh (J.B., A.H., D.A.L., R.L.); and the Department of Criminology and Criminal Justice, Arizona State University, Phoenix (D.P.).
Disclosures: Dr. Lewis has received investigator-initiated research support from Pfizer; in 2013–2015 he served as a consultant in the areas of target identification and validation and new compound development to Autifony, Bristol-Myers Squibb, Concert Pharmaceuticals, and Sunovion. The other authors report no financial relationships with commercial interests.
Discussion of unapproved or investigational use of products*: No.
*APA policy requires disclosure by CME authors of unapproved or investigational use of products discussed in CME programs. Off-label use of medications by individual physicians is permitted and common. Decisions about off-label use can be guided by scientific literature and clinical experience.
Robert Freedman, M.D. (Editor-in-Chief, AJP); Susan K. Schultz, M.D. (Deputy Editor, AJP); Michael D. Roy (Editorial Director, AJP) ; Michael A. Pogachar (Online Content Manager, Journals).
Dr. Schultz has received research support from the Alzheimer’s Disease Cooperative Study for projects conducted in partnership with Toyama Chemical Company and in partnership with Eli Lilly and Company. Dr. Freedman, Mr. Roy, and Mr. Pogachar report no financial relationships with commercial interests.
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