Dr. Vickerman herself that her results do not in any way indicate that electronic cigarettes are less effective than NRT, stating: "It may be that callers who had struggled to quit in the past were more likely to try e-cigarettes as a new method to help them quit. These callers may have had a more difficult time quitting, regardless of their e-cigarette use."

Smoking status was then assessed at the time of the interview to determine the rates of successful quitting during the most recent quit attempt, comparing the three groups: (1) e-cigarettes only; (2) NRT only; and (3) no cessation aids. The total sample size was 5,863.

The reason is this:

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