Polysubstance Use in Cannabis Users Referred for Treatment: Drug Use Profiles, Psychiatric Comorbidity and Cannabis-Related Beliefs
Open Access
- 1 January 2013
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Psychiatry
- Vol. 4, 79
- https://doi.org/10.3389/fpsyt.2013.00079
Abstract
Background: Population-based surveys demonstrate cannabis users are more likely to use both illicit and licit substances, compared with non-cannabis users. Few studies have examined the substance use profiles of cannabis users referred for treatment. Co-existing mental health symptoms and underlying cannabis-related beliefs associated with these profiles remains unexplored. Methods: Comprehensive drug use and dependence severity (Severity of Dependence Scale-Cannabis) data were collected on a sample of 826 cannabis users referred for treatment. Patients completed the General Health Questionnaire, Cannabis Expectancy Questionnaire, Cannabis Refusal Self-Efficacy Questionnaire, and Positive Symptoms and Manic-Excitement subscales of the Brief Psychiatric Rating Scale. Latent class analysis was performed on last month use of drugs to identify patterns of multiple drug use. Mental health comorbidity and cannabis beliefs were examined by identified drug use pattern. Results: A three-class solution provided the best fit to the data: (1) cannabis and tobacco users (n = 176), (2) cannabis, tobacco, and alcohol users (n = 498), and (3) wide-ranging substance users (n = 132). Wide-ranging substance users (3) reported higher levels of cannabis dependence severity, negative cannabis expectancies, lower opportunistic, and emotional relief self-efficacy, higher levels of depression and anxiety and higher manic-excitement and positive psychotic symptoms. Conclusion: In a sample of cannabis users referred for treatment, wide-ranging substance use was associated with elevated risk on measures of cannabis dependence, co-morbid psychopathology, and dysfunctional cannabis cognitions. These findings have implications for cognitive-behavioral assessment and treatment.This publication has 39 references indexed in Scilit:
- An investigation of schizotypy in injecting amphetamine usersPersonality and Individual Differences, 2013
- Self‐Efficacy as a Predictor of Outcome After Residential Treatment Programs for Alcohol Dependence: Simply Ask the Patient One Question!Alcohol: Clinical and Experimental Research, 2012
- Alcohol expectancy changes over a 12-week cognitive–behavioral therapy program are predictive of treatment successJournal of Substance Abuse Treatment, 2011
- Alcohol Expectancies and Drinking Refusal Self‐Efficacy Mediate the Association of Impulsivity With Alcohol MisuseAlcohol: Clinical and Experimental Research, 2010
- Typologies of cannabis users and associated characteristics relevant for public health: a latent class analysis of data from a nationally representative Canadian adult surveyInternational Journal of Methods in Psychiatric Research, 2010
- Patterns of illegal drug use among an adult alcohol dependent population: Results from the National Survey on Drug Use and HealthDrug and Alcohol Dependence, 2010
- Coping skills training and contingency management treatments for marijuana dependence: exploring mechanisms of behavior changeAddiction, 2008
- Cannabis use and risk of psychotic or affective mental health outcomes: a systematic reviewThe Lancet, 2007
- Subtypes of Illicit Drug Users: A Latent Class Analysis of Data From an Australian Twin SampleTwin Research and Human Genetics, 2006
- A Sociocognitive Analysis of Substance Abuse: An Agentic PerspectivePsychological Science, 1999