In other words, despite acknowledging that they cannot tell from their study whether e-cigarette use precedes smoking or whether smoking precedes e-cigarette use, they nonetheless draw the conclusion that e-cigarette use precedes smoking.

In other words, Glantz has hidden this information from the reader in the review article, even though he felt it was important enough to mention in the other article. In my opinion, this is knowing dishonesty. It is hiding critical information from the reader that would affect the reader's assessment of the validity of the study's conclusions. Moreover, the review article proceeds to do precisely what the other article argues cannot and should not be done with these studies (i.e., draw conclusions about the efficacy of e-cigarettes as smoking cessation aids).

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