Which of the following historic, first-time ever, unprecedented actions did the FDA take in order to ensure its protection of the nation's public health from the hazards of cigarette smoking?

Why?

2. Propylene glycol and/or glycerin

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.

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