The finding of reduced exhaled nitric oxide is an indication that an exposure is causing some sort of inflammatory effect on cells lining the respiratory tract. It doesn't mean anything more or less than that. You can't take two exposures - each of which causes respiratory tract inflammation - and make the statement that the effects of both exposures are equal. Risk posed by an exposure depends on many other factors, including the degree of inflammation induced, the reversibility of the effect, the nature of the exposure, the chronicity of the exposure, etc.

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."

As is so often the case, the answer is money.

If the FDA is not sure that removing all of the carcinogens from cigarettes - and reducing their concentrations to no more than trace levels - is going to make "smoking" safer (even forgetting the fact that there is no smoke and no combustion associated with vaping), then one has to ask whether the FDA is basing its positions only on science, and not on any political or ideological concerns.

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