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Updated: Jul 17, 2026
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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
Published on: August 18, 2020
Negative consequences associated with dependence in daily cannabis users.
Alison Looby1, Mitch Earleywine
1University at Albany, State University of New York, Department of Psychology, SS369, 1400 Washington Avenue, Albany, NY 12222, USA. al116784@albany.edu
Substance Abuse Treatment, Prevention, and Policy
|January 12, 2007
Summary
Daily cannabis use does not automatically lead to dependence or problems. Cannabis dependence, not frequency of use, is linked to negative outcomes like lower life satisfaction and increased health issues.
Area of Science:
- Addiction research
- Psychiatry
- Public health
Background:
- Cannabis is a widely used illicit substance in America, with increasing consumption rates.
- Theorists often link cannabis use frequency with dependence, but less than half of daily users meet dependence criteria.
- This study investigates if cannabis dependence, rather than use frequency, explains negative outcomes.
Purpose of the Study:
- To differentiate the impact of cannabis dependence from frequency of use on negative consequences.
- To identify specific problems associated with daily cannabis consumption.
- To examine the relationship between cannabis dependence and other substance use patterns.
Main Methods:
- An internet survey was administered to over 2500 adult daily cannabis users.
- Participants completed measures of cannabis and other drug use.
- A proxy measure for DSM-IV-TR cannabis dependence criteria was used for comparison.
Main Results:
- Subjects meeting cannabis dependence criteria (N=1111) consumed more cannabis, alcohol, and other drugs than non-dependent users (N=1770).
- Dependent users reported lower motivation, happiness, and life satisfaction.
- Dependent users also experienced higher levels of depression and respiratory symptoms.
Conclusions:
- Daily cannabis use alone does not necessarily result in significant associated problems.
- Meeting criteria for cannabis dependence is strongly associated with negative health and psychological outcomes.
- Higher consumption of cannabis and other substances exacerbates problems.
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