Here, they find a correlation between e-cigarette use and higher and more sustained levels of smoking. But because this is a cross-sectional study, they cannot determine which came first. In other words, what is the direction of the causal relationship? Does the e-cigarette use precede, and cause, the smoking? Or does the smoking precede, and cause, the e-cigarette use?

The CDC has done enough damage with its irresponsible and untruthful propaganda about electronic cigarettes. It is time that policy decisions be guided by science rather than politics. And the science is now in. It indicates that youth smoking levels are at record lows, which casts serious doubt on the hypothesis that electronic cigarettes are fueling an alarming increase in youth smoking.

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