The CDC's statement is wrong on its face. If there is reputable evidence from former smokers that e-cigarettes helped them quit smoking, then there is indeed conclusive scientific evidence that e-cigarettes "can work" as a cessation aid.

In fact, in a by Flouris et al., the investigators found that real cigarettes, but not the fake ones, had a significant detrimental effect on pulmonary function, measured by spirometry. This study documents that while active smoking has immediate, clinically meaningful effects in reducing lung function, electronic cigarettes do not.

For CDC:

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