maine tobacco tax New increase on products in to take effect in January Massive tobacco tax hike will

Based on smoking behavior as the independent variable, the study population was divided into four groups: (1) non-smokers, (2) ex-smokers who had been using conventional cigarettes or e-cigarettes in the past, (3) single smokers who used only conventional cigarettes, and (4) dual smokers who used conventional cigarettes and e-cigarettes

Jung KY, Yoo SH, Ma SH, Hong SH, Lee YS, Shim UY, et al

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The COI levels were categorized as No-COI, Low, Moderate, or High. When a COI was declared, the committee determined the appropriateness of involvement based on these categories (Supplementary Table 1)