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Delusional-like experiences are more common in those with cannabis dependence disorder, very early-onset alcohol use or dependence disorders, and daily smokers

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Question: Are tobacco, alcohol and cannabis use associated with delusional-like experiences (DLE)?

Population: 8773 residents of Australia aged between 16 and 85 years that took part in the Australian National Survey of Mental Health and Wellbeing. Samples were selected randomly from a stratified, multistage area probability sample of private dwellings. The survey represents an estimated population of 16 015 000 adults.

Setting: Private households, Australia; 2007.

Assessment: Participants had face to face interviews that assessed DLEs, mental health disorders and physical disorders and exposure to cannabis, tobacco and alcohol. A modified version of the World Mental Health Survey Initiative of the Composite International Diagnostic Interview (WMH-CIDI 3.0) was used to identify lifetime DLEs and lifetime DSM-IV diagnoses of mental health disorders, including anxiety disorders, depressive disorders and alcohol or drug abuse or dependence. People who answered positively on initial screening questions for these disorders were asked further ‘probe’ questions to determine diagnoses. Individuals who screened positive for schizophrenia were excluded from the current analysis. Participants were asked about their frequency of use, quantity of use, dependency and age …

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  • Sources of funding Queensland Health.


  • Competing interests None.