FIGURE 1—

Trends in Dual Use Among Current E-Cigarette Users: United States, 2014–2019

Note. NH = non-Hispanic. The y-axis shows the observed % of dual use (co-use of e-cigarettes and cigarettes or other tobacco products) among current e-cigarette users. Multivariable regression models adjusted for age, gender, and tobacco use by a household member. The interaction for year × race/ethnicity was P < .001. Overall: quadratic trend, P = .009. NH White: linear trend, adjusted odds ratio (AOR) = 0.76; 95% confidence interval (CI) = 0.72, 0.80; P < .001; quadratic trend, P = .24. NH Black: linear trend, AOR = 0.96; 95% CI = 0.87, 1.06; P = .40; quadratic trend, P = .16. Hispanic/Latino: quadratic trend, P < .001. NH other: linear trend, AOR = 0.84; 95% CI = 0.71, 1.00; P = .046; quadratic trend, P = .67.