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.

What it means is that the ERS would rather that a smoker who cannot quit using other means continue smoking than switch to electronic cigarettes. The ERS clearly states that it opposes the use of electronic cigarettes, period. Thus, it implies that it opposes the use of electronic cigarettes by a smoker who is unable to quit via any other smoking cessation method. For such an individual, the ERS statement implies that it would actually prefer the smoker to continue smoking than to quit via the use of electronic cigarettes.

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