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Dyadic cannabis use, alcohol use and relationship satisfaction: A daily diary study
Margy Y Chen1, Tiffany A Ito1, Angela D Bryan1
1Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO, USA.
Drug and Alcohol Dependence
|October 23, 2024
Summary
Heavy cannabis and alcohol co-use by one partner can decrease relationship satisfaction for both in adult couples. Alcohol-only use may increase satisfaction, while light cannabis use shows no significant relationship impact.
Area of Science:
- Psychology
- Sociology
- Public Health
Background:
- Intimate relationships significantly influence individual substance use patterns.
- Understanding the interplay between substance use and relationship dynamics is crucial for public health interventions.
Purpose of the Study:
- To examine the association between daily cannabis use, alcohol use, and relationship satisfaction in adult couples.
- To investigate the individual and interactive effects of dyadic substance use on momentary relationship functioning.
Main Methods:
- A 14-day dyadic daily diary design was employed with 33 adult couples.
- Multilevel modeling within an Actor-Partner Interdependence Model (APIM) analyzed substance use and relationship satisfaction data.
Main Results:
- Significant actor and partner effects of alcohol and cannabis use on relationship satisfaction were observed.
- For heavy cannabis users, co-use of alcohol and cannabis reduced next-day relationship satisfaction, whereas alcohol-only use increased it.
- No significant effects were found for light cannabis users or their partners.
Conclusions:
- Dyadic substance use, particularly alcohol and cannabis co-use, dynamically impacts daily relationship functioning.
- Findings extend prior research by highlighting the nuanced effects of combined substance use on relationship satisfaction.
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