1. Medscape - where the original interview with Dr. Frieden appears

According to : "The average level of cotinine (metabolized nicotine) among nonsmokers increased by 456% and the average levels of the carcinogen NNAL increased by 112% after four hours of exposure to secondhand smoke in a smoke-filled casino with a "sophisticated" ventilation system."

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.

Stated another way, Dr. Glantz is cautioning the FDA against assuming that e-cigarettes are safer than conventional cigarettes in terms of their effects on lung function.

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