To be valid, the study needs to examine e-cigarette smokers who have not tried these products before and are trying them for the first time in an attempt to quit smoking. Otherwise, the study cannot truly claim to draw conclusions about how helpful e-cigarettes are for smoking cessation among cancer patients.

Moreover, there is no evidence that - as Dr. Frieden claims - we're seeing many smokers who are inhibited from quitting because they try electronic cigarettes.

Instead, in response, a CDC official defended Dr. Frieden by suggesting that the statement was just an inconsequential slip of the tongue.

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