These data all but destroy the gateway hypothesis. They demonstrate that at the current time, the evidence simply does not support the assertion that the proliferation of e-cigarette use among youth is leading to increased smoking initiation. Electronic cigarettes are not leading to a lifetime addiction to cigarette smoking among our nation's youth.

But the truth is more nuanced. While there is no question that low-tar or "light" cigarettes are not safer, it is not the case that the introduction of filters made cigarettes more carcinogenic. I would not be able to testify in a courtroom that I believe filtered cigarettes are more dangerous than non-filtered cigarettes. Nor would I be able to testify that filtered cigarettes and non-filtered cigarettes pose equivalent cancer risk.

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