Table 4.
Past 30‐day e‐cigarette use frequency among middle school students by smoking status, National Youth Tobacco Survey 2014–2019.
| Year | None | n | Wtd n | Infrequenta | n | Wtd n | Moderate or frequent | n | Wtd n |
|---|---|---|---|---|---|---|---|---|---|
| Never smokers | |||||||||
| 2014 | 98.5 (98.1–99.0) | 8762 | 10 110 000 | 1.3 (0.9–1.7) | 131 | 130 000 | 0.2 (0.1–0.3) | 23 | 10 000 |
| 2015 | 97.7* (97.2–98.2) | 6913 | 10 150 000 | 1.9* (1.5–2.3) | 160 | 190 000 | 0.4 (0.2–0.6) | 40 | 40 000 |
| 2016 | 98.3* (98.0–98.7) | 8194 | 10 190 000 | 1.4* (1.0–1.7) | 108 | 140 000 | 0.3 (0.2–0.4) | 27 | 30 000 |
| 2017 | 98.7 (98.3–99.0) | 6589 | 10 540 000 | 1.2 (0.8–1.5) | 79 | 120 000 | –b | – | – |
| 2018 | 97.2* (96.6–97.8) | 7801 | 10 280 000 | 2.1* (1.7–2.6) | 184 | 220 000 | 0.6* (0.3–0.9) | 50 | 60 000 |
| 2019c | 93.2c (92.2–94.1) | 7513 | 10 080 000 | 5.1c (4.3–5.8) | 399 | 550 000 | 1.8c (1.4–2.1) | 143 | 180 000 |
| Former smokers | |||||||||
| 2014 | 85.4 (81.0–89.8) | 668 | 760 000 | 10.9 (7.4–14.5) | 96 | 90 000 | 3.6 (1.8–5.4) | 37 | 30 000 |
| 2015 | 80.2 (76.0–84.5) | 460 | 700 000 | 15.6 (11.5–19.6) | 89 | 130 000 | 4.2 (2.5–5.9) | 31 | 30 000 |
| 2016 | 83.8 (80.7–86.9) | 585 | 710 000 | 10.8 (8.0–13.5) | 77 | 90 000 | 5.4 (3.4–7.5) | 36 | 40 000 |
| 2017 | 88.0 (84.8–91.3) | 382 | 550 000 | 9.1 (6.0–12.3) | 40 | 50 000 | – | – | – |
| 2018 | 85.4 (81.3–89.5) | 415 | 510 000 | 8.9 (5.6–12.3) | 53 | 50 000 | 5.7* (3.2–8.1) | 32 | 30 000 |
| 2019c | 59.2c (53.0–65.3) | 326 | 410 000 | 22.9c (18.4–27.4) | 126 | 160 000 | 17.9c (12.8–23.1) | 91 | 120 000 |
| Current smokers | |||||||||
| 2014 | 54.2 (39.1–69.4) | 117 | 150 000 | 23.2 (15.3–31.0) | 78 | 60 000 | 22.6 (12.6–32.5) | 62 | 60 000 |
| 2015 | 39.9 (29.3–50.5) | 74 | 100 000 | 29.0 (19.7–38.3) | 53 | 70 000 | 31.1 (22.1–40.1) | 63 | 70 000 |
| 2016 | 42.2 (31.3–53.1) | 79 | 100 000 | 28.2 (19.1–37.4) | 51 | 70 000 | 29.6 (22.1–37.1) | 57 | 70 000 |
| 2017 | 41.4 (30.9–52.0) | 84 | 90 000 | 28.9 (17.4–40.4) | 52 | 60 000 | 29.7 (20.4–39.0) | 50 | 70 000 |
| 2018 | 27.2* (19.8–34.6) | 58 | 50 000 | 29.4 (21.7–37.1) | 44 | 50 000 | 43.4* (33.5–53.3) | 58 | 80 000 |
| 2019c | 22.0c (15.8–28.1) | 47 | 50 000 | 36.4c (28.7–44.1) | 63 | 90 000 | 41.7c (32.4–50.9) | 77 | 110 000 |
Numbers in parentheses represent 95% confidence intervals.
Wtd = weighted. Estimated total number of users was rounded down to the nearest 10 000 people.
Past 30‐day use of e‐cigarettes was determined by asking: ‘During the past 30 days, on how many days did you use e‐cigarettes?’. Smoking status is assessed with the question: ‘Have you ever tried cigarette smoking, even one or two puffs?’. ‘Never smokers’ are those who responded ‘no’ and ‘former smokers’ are those who responded ‘yes’, but report no smoking in the past 30 days. Youth who have smoked at all within the past 30 days are considered to be ‘current smokers’.
P‐value < 0.05 for the difference in prevalence compared to the previous year in a general linear model simultaneously testing the effect of smoking status, year, and the interaction between smoking status and year.
Infrequent = used e‐cigarettes 1–5 days in the past 30 days; moderate or frequent = 6–30 days.
Dashes indicate estimates that are unreliable because the relative standard error was > 30% or the unweighted denominator was < 50.
Data from 2019 are not directly comparable with estimates in previous years due to changes in the National Youth Tobacco Survey (NYTS) format from paper to electronic.