Adolescent Cannabis Use Predicts Anxiety, Depression, and Psychosis More Strongly Than Adult Use
A review of recent longitudinal research found that cannabis use during adolescence predicts development of anxiety disorders, depression, suicidal thoughts, and personality disorders, with stronger associations than in adults and greater risk with earlier initiation.
Quick Facts
What This Study Found
The review examined current trends in youth cannabis use and their mental health implications. While overall cannabis use rates showed mixed trends globally, the THC content of available cannabis had shifted toward higher levels, potentially increasing psychotogenic and memory-impairing effects.
After controlling for multiple confounders, longitudinal research showed cannabis use predicted anxiety disorders, depression, suicidal ideation, certain personality disorders, and interpersonal violence. These associations were stronger in adolescents than adults, and earlier initiation age increased risk further. Cannabis use disorder was most prevalent among youth.
Key Numbers
Cannabis use disorder most prevalent among youth. Longitudinal evidence after controlling confounders: cannabis predicts anxiety, depression, suicidality, personality disorders, violence. Associations stronger in adolescents vs. adults. Earlier initiation = greater risk.
How They Did This
Narrative review of recent epidemiological data on cannabis use trends and longitudinal research on cannabis-mental health associations in young people. Focused on studies controlling for confounders.
Why This Research Matters
This review consolidated evidence that the adolescent brain is particularly vulnerable to cannabis-related mental health consequences. The combination of increasing THC potency and adolescent neurological sensitivity creates a concerning situation for youth public health.
The Bigger Picture
The convergence of higher THC content, maintained or increasing adolescent use rates, and evidence for adolescent-specific vulnerability creates a public health concern that the review argued requires more research, better prevention, routine screening, and improved intervention.
What This Study Doesn't Tell Us
Narrative review may not capture all relevant studies. The causal direction between cannabis use and mental health remains debated. Confounding factors are difficult to fully control in observational studies. The review acknowledged that cannabis strains have changed alongside shifting potency profiles.
Questions This Raises
- ?Would regulating THC content reduce mental health risks for young users?
- ?Are prevention programs keeping pace with changing cannabis potency?
- ?Should all adolescent mental health assessments include cannabis screening?
Trust & Context
- Key Stat:
- Cannabis-mental health associations were stronger in adolescents than adults
- Evidence Grade:
- Narrative review of longitudinal studies with controlled confounders; moderate evidence base.
- Study Age:
- Published in 2013. Adolescent cannabis and mental health research has continued to grow.
- Original Title:
- Changes in cannabis use among young people: impact on mental health.
- Published In:
- Current opinion in psychiatry, 26(4), 325-9 (2013)
- Authors:
- Copeland, Jan(12), Rooke, Sally, Swift, Wendy(2)
- Database ID:
- RTHC-00664
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
Is cannabis more dangerous for teenagers than adults?
This review found that the associations between cannabis use and mental health problems (anxiety, depression, psychosis, suicidality) were stronger in adolescents than adults. Additionally, cannabis use disorder was most prevalent among youth, and earlier age of first use increased risk. The developing adolescent brain appears to be more vulnerable to cannabis-related harm.
Has cannabis gotten stronger?
Yes. The review noted that the cannabinoid profile of available cannabis has shifted toward higher THC levels, potentially increasing the risk of psychosis-like experiences and memory impairment. Some of the strains available today have THC concentrations far above what was available in previous decades.
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Cite This Study
https://rethinkthc.com/research/RTHC-00664APA
Copeland, Jan; Rooke, Sally; Swift, Wendy. (2013). Changes in cannabis use among young people: impact on mental health.. Current opinion in psychiatry, 26(4), 325-9. https://doi.org/10.1097/YCO.0b013e328361eae5
MLA
Copeland, Jan, et al. "Changes in cannabis use among young people: impact on mental health.." Current opinion in psychiatry, 2013. https://doi.org/10.1097/YCO.0b013e328361eae5
RethinkTHC
RethinkTHC Research Database. "Changes in cannabis use among young people: impact on mental..." RTHC-00664. Retrieved from https://rethinkthc.com/research/copeland-2013-changes-in-cannabis-use
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.