And even if vaping involved deeper inhalation than smoking, how would that demonstrate that vaping is more dangerous than smoking, especially since the vaper is inhaling far fewer carcinogenic chemicals - and at far lower levels - than the smoker?

Nevertheless, this does not stop the authors from drawing a conclusion. They conclude, despite their acknowledged inability to draw such a conclusion, that: "e-cigarette use is aggravating rather than ameliorating the tobacco epidemic among youths."

One possible answer appears in Wride's column. She writes:

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