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."

In an published today in the Wall Street Journal, I highlight the fact that many legislators and health organizations have demonized electronic cigarettes, largely on the basis of the erroneous conclusion that there is scientific evidence demonstrating that these products are a gateway to cigarette smoking among youth. The piece points out that there actually is no such scientific evidence and in fact, it presents evidence to the contrary.

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