In other words, what the CDC is saying is:

Dr. Foulds and colleagues developed a 10-question scale to assess nicotine dependence and administered it to a sample of 2,368 current electronic cigarette users. Subjects were asked to fill out the scale to assess the level of their addiction while smoking, and then again to assess the level of their current addiction using electronic cigarettes.

To illustrate this, let's consider the five studies which the authors cite as providing evidence that electronic cigarettes inhibit smoking cessation.

Not exactly.

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