Readers should be cautioned that this study should not be used to conclude that e-cigarettes are twice as effective as NRT for smoking cessation generally, for reasons explained articulately by Carl Phillips in his on this study.

"There is no evidence, no convincing evidence that using e-cigarettes leads to people quitting, there's not even convincing evidence it leads to people smoking less, although that might be possible," he said.

If the policy were based on health principles, it would encourage smokers to quit, and therefore, it would reward smokers who are trying to quit using nicotine patches, nicotine gum, or electronic cigarettes, rather than exclude these individuals from employment.

It is clear from the overall evidence that electronic cigarettes are not as risky as tobacco cigarettes in terms of acute effects on lung function. On this issue, Dr. Glantz's comment is simply wrong.

But e-cigarettes should not be treated the same as cigarettes. Doing so removes the incentive for people to switch from real cigarettes to e-cigarettes and therefore will increase smoking, and with it, death.

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