Among U.S. adults who smoked daily and explicitly never planned to quit, those who took up daily e-cigarette use were 14.6 times more likely to reduce or discontinue cigarette smoking compared to non-adopters (53.5% vs 10.0%, AOR=14.58; 95% CI: 5.99–35.50), per longitudinal analysis of 2014–2021 PATH Study cohort data. Higher nicotine dependence was associated with roughly half the odds of reduction. Notably, only 2% of this population adopted daily e-cigarette use during follow-up.
This finding carries real clinical weight precisely because it targets the hardest-to-reach subgroup of smokers — those with no intention of quitting — who contribute disproportionately to smoking-attributable mortality. Standard cessation programs systematically exclude these individuals, making population-level evidence on passive pathways off cigarettes especially valuable. The magnitude of the association (nearly 15-fold) is striking, though the observational design precludes causal inference; self-selection into e-cigarette use likely explains some of this effect. The extremely low uptake rate (2%) also limits the public health impact in absolute terms. Still, the finding aligns with harm-reduction frameworks suggesting that e-cigarettes may serve as a de facto cessation bridge even without deliberate quit intent. Clinicians might consider raising e-cigarette options with patients who refuse cessation counseling. Confirmatory randomized evidence in this population remains absent and urgently needed.