Changes in E-Cigarette Use Among U.S. Adults, 2019–2021, in the American Journal of Preventive Medicine
key takeaway: "E-cigarette use prevalence increased among younger adults between 2019 and 2021 (8.8%−10.2%, adjusted prevalence difference=1.7% points, 95% CI=0.1, 3.3), primarily owing to an increase among those who never smoked cigarettes (4.9%−6.4%, adjusted prevalence difference=1.7% points, 95% CI=0.3, 3.1). People who never smoked cigarettes constituted 53% (2.68 million) of younger adults who used E-cigarettes in 2021, increasing by 0.71 million from 2019. Conversely, among middle age and older adults, the prevalence was similar in 2019 and 2021 irrespective of cigarette smoking status, and those who formerly smoked cigarettes constituted the largest proportion of people who used E-cigarettes in 2021 (age 30–44 years: 51.8%, 1.8 million; age 45–59 years: 51.6%, 0.85 million; age ≥60 years: 47.5%, 0.45 million)."
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