Cannabis use was common before first manic episodes in bipolar disorder
About 70% of bipolar patients reported lifetime cannabis use, and cannabis use was associated with earlier onset of first mania and more frequent mood episodes, though the causal direction remained unclear.
Quick Facts
What This Study Found
This review examined the relationship between cannabis use and the onset of mania in bipolar disorder. Across the studies reviewed, lifetime cannabis use among bipolar patients was approximately 70%, with about 30% meeting criteria for cannabis abuse or dependence.
Cannabis use was associated with younger age at onset of first manic episode and with more frequent depressive and manic episodes, though the evidence was somewhat inconsistent. Cannabis consumption was also related to poorer overall outcomes and an increased risk of rapid cycling or mixed episodes.
An unexpected finding emerged regarding cognition: neurocognitive functioning appeared to be better in bipolar patients who used cannabis compared to those who did not, though this may reflect a selection effect where higher-functioning individuals are more likely to access and use cannabis.
Key Numbers
Approximately 70% lifetime cannabis use in bipolar patients. About 30% comorbid cannabis abuse or dependence. Cannabis use was associated with earlier first mania onset and more frequent mood episodes.
How They Did This
Literature review searching Medline and PsychInfo databases for articles published between 1972 and December 2013 using keywords related to first manic episode, onset of mania, bipolar disorder, and cannabis.
Why This Research Matters
Bipolar disorder affects approximately 1-2% of the population, and cannabis is the most commonly used drug among bipolar patients. Understanding whether cannabis triggers or accelerates manic episodes has direct implications for clinical management of bipolar disorder.
The Bigger Picture
The high rate of cannabis use among bipolar patients raises the question of whether cannabis is a trigger, a self-medication attempt, or both. The association with earlier onset and worse course, combined with the unresolved causal direction, makes this a critical area for longitudinal research.
What This Study Doesn't Tell Us
Definitions of cannabis use and dependence varied across studies. No controlled studies directly tested whether cannabis causes mania. The temporal relationship between cannabis use and first manic episode was often unclear. Selection biases in clinical samples may affect prevalence estimates.
Questions This Raises
- ?Does cannabis trigger mania in genetically vulnerable individuals, or do early bipolar symptoms drive cannabis use?
- ?Would cannabis abstinence reduce episode frequency in bipolar patients?
- ?Do THC and CBD have different effects on mood cycling?
Trust & Context
- Key Stat:
- 70% lifetime cannabis use among bipolar patients; 30% had cannabis use disorders
- Evidence Grade:
- Narrative review of existing studies with consistent associations but no controlled trials to establish causation.
- Study Age:
- Published in 2014. The relationship between cannabis and bipolar disorder continues to be studied.
- Original Title:
- Cannabis use and first manic episode.
- Published In:
- Journal of affective disorders, 165, 103-8 (2014)
- Authors:
- Bally, Nathalie, Zullino, Daniele, Aubry, Jean-Michel
- Database ID:
- RTHC-00762
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
Does cannabis cause manic episodes?
This review found that cannabis use was associated with earlier onset of mania and more frequent mood episodes in bipolar patients. However, the causal direction could not be determined from available studies.
How common is cannabis use among people with bipolar disorder?
Approximately 70% of bipolar patients reported lifetime cannabis use, and about 30% met criteria for cannabis abuse or dependence, making it the most commonly used drug in this population.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-00762APA
Bally, Nathalie; Zullino, Daniele; Aubry, Jean-Michel. (2014). Cannabis use and first manic episode.. Journal of affective disorders, 165, 103-8. https://doi.org/10.1016/j.jad.2014.04.038
MLA
Bally, Nathalie, et al. "Cannabis use and first manic episode.." Journal of affective disorders, 2014. https://doi.org/10.1016/j.jad.2014.04.038
RethinkTHC
RethinkTHC Research Database. "Cannabis use and first manic episode." RTHC-00762. Retrieved from https://rethinkthc.com/research/bally-2014-cannabis-use-and-first
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.