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Of these adverse events, 49 were for abnormal dreaming

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Definition of variables Types of cigarette-use variable The exposure variable was types of cigarette use, which were divided into three types consisting of e-cigarettes, combined cigarettes, and conventional cigarettes according to the question, What types of cigarettes did you use in the past 30 days? We then used two types of exposure variables and examined their effects with respect to both types in our analyses: time-independent exposure and time-dependent exposure