Based on this single study, Dr. Glantz concludes: "the FDA must be extremely careful about assuming that e-cigarettes uniformly pose less risk than conventional cigarettes."

In this cross-sectional study, a sample of adults who smoked at any point in the past 12 months was identified from a national household survey conducted in England between 2009 and 2014. Criteria for inclusion in the study were: (1) having made a serious quit attempt in the past year; (2) having used e-cigarettes alone, NRT alone, or an unaided quit attempt during their most recent quit attempt; and (3) not having used a prescription cessation drug or behavioral counseling during their most recent quit attempt.

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