Washington state has observed increases in polydrug use in fatal crashes, primarily involving the combination of cannabis and alcohol. The purpose of this article is to explore the belief system associated with driving under the influence of cannabis and alcohol (DUICA) in Washington state using structural equation modeling (SEM). A convenience sample (n = 737) of surveys collected from adults in Washington state was analyzed using SEM to reveal the latent structure of the belief system associated with DUICA. The results of this analysis indicated that the reported DUICA behavior (frequency) was predicted by intention and willingness. Willingness also predicted intention. Intention and willingness were predicted by positive attitudes toward DUICA, as well as normative perceptions that it was acceptable to important people and common behavior for most people. These components were themselves predicted by corresponding beliefs (behavioral beliefs, normative beliefs, and control beliefs). Finally, these beliefs were also influenced by the values that were most important to the respondents. Based on these results, it is reasonable to speculate that strategies to change these beliefs may also reduce DUICA behavior and associated fatal crashes.

华盛顿州观察到致命车祸中多种药物的使用有所增加，主要涉及大麻和酒精的组合。本文的目的是使用结构方程模型 (SEM) 探索与在华盛顿州大麻和酒精 (DUICA) 影响下驾驶相关的信念系统。一个方便的样本（n= 737) 从华盛顿州的成年人收集的调查使用 SEM 进行分析，以揭示与 DUICA 相关的信念系统的潜在结构。该分析的结果表明，报告的 DUICA 行为（频率）是由意图和意愿预测的。意愿也预测了意图。通过对 DUICA 的积极态度以及对重要人物和大多数人的共同行为是可以接受的规范性认知来预测意图和意愿。这些成分本身是由相应的信念（行为信念、规范信念和控制信念）预测的。最后，这些信念还受到受访者最重要的价值观的影响。基于这些结果，