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Is prevalence of e-cigarette and nicotine replacement therapy use among smokers associated with average cigarette consumption in England? A time-series analysis
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  • Published on:
    Study population
    • Sue Wilson, Emeritus Professor of Clinical Epidemiology University of Birmingham

    Could you clarify the study population? It is unclear to me whether people who completely stopped smoking during the study period were included in the study population. If, as appears the case, such potential subjects were excluded, this would result in a significant underestimate of the association between e-cigarette and NRT use and average cigarette consumption.

    Conflict of Interest:
    None declared.