Young Adults Who Use More Cannabis When Depressed Develop More Problematic Use Over Time

What the researchers found

Over 24 consecutive months, there was substantial variability in how individual young adults' substance use responded to depressive symptoms. Some used more cannabis when depressed, others used less. Those who consistently increased cannabis use during depressive episodes reported greater hazardous cannabis use at 30-month follow-up. Interestingly, this pattern did not predict 30-month depressive symptoms, suggesting substance escalation rather than worsening depression.

Why it matters

This study distinguishes between people who use cannabis to cope with depression versus those who reduce use when feeling low. The finding that depression-driven escalation predicts problematic use, but not worsening depression, suggests the primary concern is developing a harmful use pattern rather than depression worsening itself.

The numbers in context

772 participants. 24 monthly surveys. 30-month follow-up. Mean age 21.1. 57% female. Substantial individual variability in depression-substance use associations. Depression-linked cannabis escalation predicted hazardous use but not later depression.

How the study worked

Longitudinal study of 772 young adults (mean age 21.1, 57% female) in Washington State with 24 monthly surveys measuring depressive symptoms and substance use, plus a 30-month follow-up assessing hazardous use and depression. Multilevel models extracted person-specific within-person associations, linked to later outcomes.

What this study cannot tell us

Washington State sample may not generalize. Self-reported monthly measures may miss day-to-day fluctuations. Cannot determine causation even with longitudinal design. Attrition over 30 months. Cannabis quantity not measured, only hours high.

How to read the evidence

Moderate: strong longitudinal design with intensive monthly measurement, though self-reported data and single-state sample.

When this study was published

2025 study

The bigger picture

Not everyone who uses cannabis during depressive episodes is at risk. This study shows the critical distinction is the pattern: consistently reaching for more cannabis when depressed, rather than less, signals a trajectory toward problematic use. Identifying this pattern early could enable targeted intervention.

Questions still open

• Could identifying the depression-escalation pattern early trigger timely intervention? Does this pattern reflect pharmacological tolerance or psychological coping? Would teaching alternative coping strategies prevent the escalation pattern?

Common questions

Read the original research

Monthly patterns of depressive symptoms and substance use and their relation to longer-term hazardous substance use and mental health problems: Examining mutual maintenance using monthly data from young adults.

Addictive behaviors, 166, 108326

Citation

Rhew, Isaac C; Graupensperger, Scott; Martinez, Griselda; Lee, Christine M. (2025). Monthly patterns of depressive symptoms and substance use and their relation to longer-term hazardous substance use and mental health problems: Examining mutual maintenance using monthly data from young adults.. Addictive behaviors, 166, 108326. https://doi.org/10.1016/j.addbeh.2025.108326

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