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.
Read this if you are a parent, educator, or young person concerned about cannabis and mental health.
Cannabis-mental health associations were stronger in adolescents than adults
What the researchers 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.
Why it 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 numbers in context
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 the study worked
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.
What this study cannot 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.
How to read the evidence
Narrative review of longitudinal studies with controlled confounders; moderate evidence base.
When this study was published
Published in 2013. Adolescent cannabis and mental health research has continued to grow.
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.
Questions still open
- 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?
Common questions
Is cannabis more dangerous for teenagers than adults?
Has cannabis gotten stronger?
Read the original research
Changes in cannabis use among young people: impact on mental health.
Current opinion in psychiatry, 26(4), 325-9
Citation
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
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