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Instead, it flattens the risk difference and makes cigarettes appear less uniquely dangerous

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This means that the independent variable (social disadvantage) was measured on the between participant level, whereas the dependent variable (CPD) and the mediator variable (perceived daily stress) were assessed on the within participant level, i.e

Only the research pharmacists will be unblinded to group assignment

Current cigarette smoking only comprised participants who currently smoked cigarettes but did not currently use e-cigarettes