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To understand whether using a certain e-cigarette device is more strongly associated with risk of combustible tobacco use among youth. We conducted multivariable logistic regression analyses using cross-sectional data from 4 samples of youth in Connecticut and California (N=10,482; ages 13-24), separately for each study using the total sample and the sample of past-month e-cigarette users, to understand the association between e-cigarette device type and past-month combustible tobacco use, while controlling for age, sex, race/ethnicity,