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There is a link to  the abstract that was presented in the press release above.

We control for current and past cigarette smoking by including smoking status (never, former, some days, or daily) in the same logistic regression model as we include e-cigarette use (quantified the same way).  The effects of smoking and e-cigarette use are independent of each other and assessed at the same time.

Thus, the effects of e-cig use that we estimate are on top of any effects of smoking, whether people are current or former smokers.

 

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