Table 5.

Table with the estimated current, frequent, and daily E-cigarette use prevalence among youth in the united states as estimated by the monitoring the future survey.

Years	Current use			Daily use			Frequent use (≥20 days)			Daily use among current users			Frequent use among current users (≥20 days)
	8th	10th	12th	8th	10th	12th	8th	10th	12th	8th	10th	12th	8th	10th	12th
2014	8.7 (7.7–9.7)	16.3 (15.0–17.6)	17.2 (16.3–18.2)	–	–	–	0.9 (0.6–1.3)	1.9 (1.5–2.4)	2.9 (2.4–3.3)	–	–	–	10.3 (7.4–14.2)	11.7 (9.3–14.7)	16.6 (14.3–19.1)
2015	9.4 (8.5–10.6)	13.9 (12.8–15.0)	16.2 (15.3–17.2)	–	–	–	1.1 (0.8–1.5)	2.3 (1.8–2.8)	3.1 (2.7–3.6)	–	–	–	11.6 (8.4–15.7)	16.3 (13.4–19.7)	19.3 (16.9–22.0)
2016	6.3 (5.6–7.1)	10.4 (9.4–11.5)	12.3 (11.5–13.2)	–	–	–	0.8 (0.6–1.1)	1.3 (1.0–1.7)	2.1 (1.7–2.5)	–	–	–	12.7 (9.2–17.3)	12.2 (9.4–15.7)	16.8 (14.3–19.6)
2017	6.8 (6.0–7.7)	10.7 (9.7–11.9)	15.4 (13.7–17.3)	–	–	–	1.1 (0.8–1.6)	2.2 (1.7–2.7)	3.2 (2.5–4.1)	–	–	–	16.8 (12.5–22.2)	20.1 (16.4–24.6)	20.6 (16.2–25.9)
2018	–	–	25.6 (23.4–27.9)	–	–	–	–	–	9.0 (7.7–10.4)	–	–	–	–	–	35.1 (30.7–39.8)
2019	9.6 (8.9–10.4)	20.5 (19.5–21.6)	25.5 (24.4–26.6)	–	–	–	2.0 (1.7–2.4)	7.0 (6.4–7.7)	11.7 (10.9–12.6)	–	–	–	21.0 (17.9–24.4)	34.2 (31.6–36.9)	46.1 (43.6–48.6)
2020a	10.9 (9.3–12.6)	21.6 (19.8–23.4)	25.9 (23.4–28.5)	0.8 (0.4–1.5)	3.1 (2.4–3.9)	5.1 (4.1–6.3)	1.7 (1.1–2.7)	6.2 (5.1–7.5)	8.0 (6.6–9.7)	7.0 (3.7–12.9)	14.3 (11.4–17.8)	19.7 (15.9–24.2)	15.9 (10.5–23.4)	28.5 (24.1–33.4)	31.0 (26.0–36.5)
2021	7.4 (6.8–8.0)	13.6 (12.8–14.4)	–	1.0 (0.8–1.2)	2.5 (2.2–2.9)	–	1.7 (1.4–2.0)	4.2 (3.7–4.7)	–	13.3 (11.0–16.2)	18.6 (16.3–21.0)	–	22.7 (19.6–26.2)	30.6 (27.8–33.6)	–

Question assessing e-cigarette use was changed from general e-cigarette use to nicotine vaping in 2017.

^aDue to COVID-19, participant recruitment was halted leading to small number of participants (25% of usual sample size)—large confidence intervals.