QuickStats: Percentage Distribution of Cigarette Smoking Status Among Current Adult E Cigarette Users, by Age Group National Health Interview Survey, United States, 2021 MMWR Science has marched on: it's time to update the advice to Canadians Physicians for a Smoke Free Canada Population Based Disease Odds for E Cigarettes and Dual Use versus Cigarettes NEJM Evidence Increased e cigarette use prevalence is associated with decreased smoking prevalence among US adults Harm Reduction Journal Springer Nature Link