Electronic cigarettes, on the other hand, have a clean and cool hit that is soft on the lungs and is designed to satisfy your nicotine cravings, not your cravings for smoke.

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?

The article does mention that a clinical trial of e-cigarettes found that these products were as effective as the nicotine patch, but it then dismisses this result, concluding instead that: "e-cigarettes are not associated with successful quitting in general population-based samples of smokers."

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