The authors of this study make one of the most cardinal errors in all of epidemiology. They ignore the principle that "correlation does not equal causation."

Of course, the FDA is not going to take either of these actions. Because it knows where its bread is buttered. In contrast, however, the very same agency is prepared to pull thousands of electronic cigarettes from the market even though there really is no reliable evidence of any harms being caused by these products (with the exception of exploding batteries, which the agency should immediately address via a manufacturing standard requirement).

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