Abstract

BACKGROUND: Cannabis use patterns vary considerably, with many users reporting simultaneous and non-simultaneous use (co-use) of other substances. Despite this, little research has examined the extent to which subtypes of cannabis users may be identified based on their simultaneous and co-use behaviors. METHODS: The sample consisted of adult Australian twins and siblings who reported lifetime cannabis use (n?=?2590). A latent class analysis was conducted to determine subtypes of cannabis users based on five indicators of substance co-use and simultaneous use. Adolescent correlates (age of substance initiation and conduct disorder) and adult correlates (substance use/disorder and depression) of class membership were assessed. Twin similarity for class membership was also examined. RESULTS: (1)?=?7.19, p = 0.007). CONCLUSIONS: The current study identified four classes of cannabis users at varying degrees of risk. Results suggest that simultaneous tobacco and cannabis use may be especially associated with deleterious outcomes.

Authors	Davis, Christal N; Slutske, Wendy S; Martin, Nicholas G; Agrawal, Arpana; Lynskey, Michael T
Journal	DRUG AND ALCOHOL DEPENDENCE
Pages	107696
Volume	205
Date	1/10/2019
Grant ID	K02 DA032573
Funding Body	NIDA NIH HHS
URL	http://www.ncbi.nlm.nih.gov/pubmed/?term=10.1016/j.drugalcdep.2019.107696
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