Center for Alcohol and Addiction Studies, Brown University School of Public Health.
Department of Behavioral and Social Sciences, Brown University School of Public Health.
Psychol Addict Behav. 2022 May;36(3):243-253. doi: 10.1037/adb0000813. Epub 2022 Feb 3.
Simultaneous alcohol and cannabis use is common among college students and associated with more consumption and consequences compared to single-substance use. This study examined occasions of simultaneous use and compared planned occasions to unplanned occasions with respect to motives, contexts, consumption, and consequences.
College student simultaneous users ( = 341; 53% women; 74% White) completed five daily surveys for 54 days. Mixed-effects models examined motives and contexts of simultaneous use occasions as a function of whether alcohol and cannabis use were (a) both planned versus (b) unplanned, no use planned, or (c) unplanned, single-substance use planned and whether alcohol and cannabis consumption and negative simultaneous use-related consequences varied across planned versus unplanned occasions.
Social and enhancement motives were related to planned simultaneous use; offered and coping motives were associated with planned single-substance use that became simultaneous use (vs. planned simultaneous use). Compared to unplanned use, planned simultaneous use was negatively associated with using at home or alone, and positively associated with using with others, more intoxicated people, and more people using cannabis. Planned simultaneous use was associated with more alcohol and cannabis consumption. No significant differences were found for negative consequences.
Planned simultaneous use was motivated by social and enhancement reasons, whereas planned single-substance use that became simultaneous use was more likely motivated by offers or for coping. Planned simultaneous use resulted in greater consumption, but not negative consequences. Results provide specific motives and contexts associated with unplanned and planned simultaneous use to be incorporated into real-time interventions. (PsycInfo Database Record (c) 2022 APA, all rights reserved).
大学生同时饮酒和吸食大麻的现象很常见，与单一物质使用相比，这种行为会导致更多的消费和更严重的后果。本研究考察了同时使用两种物质的情况，并比较了有计划和无计划使用的场合在动机、情境、消费和后果方面的差异。
大学生同时使用者（n=341；53%为女性；74%为白人）完成了 54 天内 5 次的每日调查。混合效应模型检验了同时使用场合的动机和情境，这些场合的使用是有计划的（a）还是无计划的（b），或者没有计划，或者计划使用一种物质，同时使用另一种物质（c），以及酒精和大麻的消费以及负面的同时使用相关后果是否因计划和非计划场合的不同而有所不同。
社交和增强动机与有计划的同时使用有关；提供和应对动机与计划使用一种物质，同时使用另一种物质（而不是计划同时使用）有关。与无计划使用相比，计划同时使用与在家或独自使用呈负相关，与与他人一起使用、更多醉酒的人一起使用、更多人使用大麻呈正相关。计划同时使用与更多的酒精和大麻消费有关。未发现负面后果有显著差异。
计划同时使用是出于社交和增强的原因，而计划使用一种物质，同时使用另一种物质，则更有可能是出于提供或应对的动机。计划同时使用会导致更多的消费，但不会产生负面后果。这些结果提供了与无计划和有计划同时使用相关的具体动机和情境，可将其纳入实时干预措施中。
