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."

3. Tobacco companies are promoting electronic cigarettes as being safe.

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 complete quote from this article:

The most telling point is Dr. Glantz's opposition to legislation that classifies electronic cigarettes as being separate from tobacco products. The electronic cigarette associations have been lobbying local and state governments not to classify e-cigarettes as tobacco products. This makes perfect sense because they are not tobacco products. They contain no tobacco. They are orders of magnitude safer than cigarettes and should not be treated in the same category for regulatory purposes.

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