For obvious reasons, the Glantz approach is the wrong one to take, and the Brown et al. approach is correct. This study demonstrates that when you analyze the data the proper way, it appears that electronic cigarettes -- for the right smokers -- can be an effective smoking cessation tool.

"The vast majority of people who smoke them now also smoke conventional cigarettes, he [Stan Glantz] said, and there is little evidence that much switching is happening. E-cigarettes may even prolong the habit, he said, by offering a dose of nicotine at times when getting one from a traditional cigarette is inconvenient or illegal."

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