Table 1

Transitions in P30D product use at W2 (2014/15) and W3 (2015/16) among W1 (2013/14) P30D ENDS* users

YouthYoung AdultsAdults 25+
W1 Exclusive ENDS UseW1 ENDS PTU w/CIGSW1 ENDS PTU w/o CIGSW1 Exclusive ENDS UseW1 ENDS PTU w/CIGSW1 ENDS PTU w/o CIGSW1 Exclusive ENDS UseW1 ENDS PTU w/CIGSW1 ENDS PTU w/o CIGS
Mutually Exclusive PathwaysWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CIWeighted %95% CI
Persistent ENDS use type at all waves Continuing the same W1 use type (exclusive, PTU w/CIGS, or PTU w/o CIGS) at each wave3.7†a 1.1 to 11.626.3a 18.9 to 35.4N/AN/A4.3†a 1.5 to 11.619.2a,c 16.5 to 22.39.5†c 4.7 to 18.634.3a,b 29.2 to 39.918.8a,c 16.9 to 21.05.7†b,c 2.4 to 13.1
ENDS use type reuptake The same broad use type (exclusive or PTU) at W1 and W3 (but a different tobacco use at W2)4.6†a,b 1.7 to 12.121.8a 14.9 to 30.639.0b 25.9 to 54.05.9†a,b 3.0 to 11.415.6a,c 12.9 to 18.827.6b,c 20.6 to 35.97.1b 4.3 to 11.611.79.8 to 13.919.2b 11.7 to 29.8
ENDS use type transition Transition from W1 exclusive use to PTU by W3, or transition from W1 PTU to exclusive use by W3 (without discontinuing all tobacco use at W2)18.7a,b 12.0 to 28.02.5†a 0.8 to 7.75.7†b 1.4 to 20.710.5a 6.2 to 17.23.4a 2.1 to 5.34.1†1.8 to 8.99.56.2 to 14.35.44.2 to 6.95.5†2.7 to 10.7
Switch or discontinue ENDS use, but continue other tobacco use W1 exclusive user who switches to another tobacco product by W3 or W1 polytobacco user that discontinues ENDS use by W3 but uses another tobacco product (without discontinuing all tobacco use at W2)6.9†a 3.5 to 13.126.5a 19.2 to 35.518.2†9.3 to 32.722.5a 15.6 to 31.244.8a,c 40.8 to 48.828.0c 19.9 to 37.99.3a,b 6.4 to 13.554.1a 51.2 to 57.040.1b 27.5 to 54.2
Tobacco use reuptake W1 users who discontinue all tobacco use at W2 and use again at W312.26.8 to 20.95.0†2.2 to 10.98.8†3.5 to 20.211.0b 6.8 to 17.55.13.5 to 7.33.6†b 1.4 to 8.55.7a,b 3.5 to 9.11.7a 1.1 to 2.50.7†b 0.1 to 5.1
Discontinue all tobacco use W1 users who discontinue all tobacco use at either W2 and W3 or just W353.9a,b 44.6 to 63.017.9a 12.2 to 25.628.3b 16.6 to 43.845.8a,b 35.3 to 56.511.9a,c 9.5 to 14.927.2b,c 18.8 to 37.634.0a 28.3 to 40.18.3a,c 6.9 to 9.928.8c 18.7 to 41.4
  • Analysis included youth (ages 12–17), young adult (ages 18–24) and adult 25+ (ages 25 and older) W1 P30D ENDS users with data at all three waves. Respondent age was calculated based on age at W1. W3 longitudinal (all-waves) weights were used to calculate estimates. All tobacco use is defined as P30D use. Use type refers to exclusive use, PTU w/CIGS or PTU w/o CIGS.

  • adenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 Exclusive ENDS Use and W1 ENDS PTU w/CIGS

  • bdenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 Exclusive ENDS Use and W1 ENDS PTU w/o CIGS

  • cdenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 ENDS PTU w/CIGS and W1 ENDS PTU w/o CIGS

  • *Respondents were asked about ‘e-cigarettes’ at W1 and ‘e-products’ (ie, e-cigarettes, e-cigars, e-pipes and e-hookah) at W2 and W3.

  • The logit-transformation method was used to calculate the 95% CIs.

  • Analyses were run on the W1, W2 and W3 Public Use Files (https://doi.org/10.3886/ICPSR36498.v8).

  • †Estimate should be interpreted with caution because it has low statistical precision. It is based on a denominator sample size of less than 50, or the coefficient of variation of the estimate or its complement is larger than 30%.

  • CI, confidence interval; CIGS, cigarettes; ENDS, electronic nicotine delivery system; N/A, not applicable due to zero cases; P30D, past 30-day; PTU, polytobacco use; W1, Wave 1; W2, Wave 2; W3, Wave 3.