The truth is that many of the electronic cigarette users in the study did not use electronic cigarettes in their quit attempts! According to data provided in the paper, a full 28% of the sample of electronic cigarettes did not use these products in their quit attempts.

Here, they find a correlation between e-cigarette use and higher and more sustained levels of smoking. But because this is a cross-sectional study, they cannot determine which came first. In other words, what is the direction of the causal relationship? Does the e-cigarette use precede, and cause, the smoking? Or does the smoking precede, and cause, the e-cigarette use?

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