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?

Monday's CNN Opinion page featured an on electronic cigarettes from Harold Wimmer, the president and CEO of the American Lung Association. In the piece, Wimmer argues that Big Tobacco companies are using electronic cigarettes to create "new nicotine addicts" and that they are enticing youth with flavors such as bubble gum and cotton candy.

The odds ratio for successful quitting for the e-cigarette group compared to subjects who used NRT was 2.23 (95% confidence interval, 1.70-2.93).

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