In other words, what the CDC is saying is:

3. Flavors

2. "Formaldehyde, benzene and the pyrolysis products acrolein and acetone did not exceed background concentrations."

B. Four

The main study finding was as follows: "The assessment of lung function demonstrated that neither a brief session of active e-cigarette smoking nor a 1 hour passive e-cigarette smoking session significantly interfered with normal lung function. On the other hand, acute active and passive tobacco cigarette smoking undermined lung function, as repeatedly shown in previous studies."

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