If this study leads some smokers to smoke inside because they believe the researchers, who say that thirdhand smoke is no less harmful than secondhand smoke, then this could lead to serious public health harm to children.

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.

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