Table 1

Association of ice-flavoured e-cigarette use and with tobacco product use characteristics

OutcomesNo. (%) or mean (SD)Associations from regression models*
Menthol/mint†Fruit/sweet†Ice†Ice vs menthol/mintIce vs fruit/sweet
(n=60)(n=116)(n=168)OR or b (95% CI)P valueOR or b (95% CI)P value
Categorical variables‡
Past 30-day combustible tobacco use (yes vs no)§13 (21.7)38 (32.8)53 (31.5) 2.7 (1.3 to 5.7)0.011.2 (0.7 to 2.1)0.59
Device used most often
 Rechargeable/refillable tanks/pens or others¶15 (29.4)60 (59.4)45 (31.3)ReferenceReference
 JUUL or similar rechargeable with cartridges12 (23.5)6 (5.9)5 (3.5) 0.1 (0.03 to 0.45)0.0021.5 (0.4 to 5.6)0.57
 Disposable without separate cartridges/pods24 (47.1)35 (34.7)94 (65.3)1.3 (0.6 to 2.8)0.54 3.9 (2.1 to 7.4)<0.001
Vaping dependence symptoms (yes vs no)**40 (66.7)49 (43)112 (67.1)1 (0.5 to 1.9)0.93 2.6 (1.5 to 4.4)<0.001
Past 6-month quit vaping attempt (yes vs no)††23 (39)43 (37.7)85 (51.5)1.7 (0.9 to 3.3)0.101.4 (0.8 to 2.4)0.19
Started vaping during vs after high school‡‡40 (72.7)71 (65.1)122 (73.9)1.1 (0.5 to 2.3)0.77 1.9 (1.02 to 3.37)0.04
Continuous variables (past 30 days)§§
No. days vaped¶¶12.2 (11.2)12.1 (11.8)17 (11.5) 4.4 (1 to 7.7)0.01 3.6 (0.8 to 6.4)0.01
No. vaping episodes/day***9 (7.5)7.6 (8.1)10.8 (7.9)1.5 (−0.8 to 3.8)0.19 2.4 (0.5 to 4.3)0.01
No. puffs/episode†††4.1 (5.2)3.2 (4.1)3.6 (3.4)−0.4 (−1.6 to 0.8)0.490.3 (−0.7 to 1.3)0.55
  • Unless otherwise noted, n=344. Significant associations are depicted in bold.

  • Bold values indicate p<0.05.

  • *Multivariable model including e-cigarette flavour most often used variable and all covariates listed in online supplemental appendix table 1 as simultaneous regressors.

  • †The menthol/mint group collapsed ‘menthol’ (n=23) or ‘mint‘ (n=37) responses; fruit/sweet (eg, fruit, candy, dessert, buttery); and ice-fruit combinations (blueberry ice, melon ice, banana ice, ice pineapple).

  • ‡No. (column %) and ORs from logistic regression models shown.

  • §Any use of cigarettes, big cigars, little cigars or cigarillos or hookah waterpipe, use >1 vs. 0 products.

  • ¶‘Mod or mech-mod rechargeable’, ‘Box mod’, ‘Other tank style device’, ‘Any other electronic nicotine device’ (available n=296).

  • **Hooked on nicotine checklist for e-cigarettes 1≥ vs 0 symptoms (n=341).

  • ††‘During the past 6 months, have you stopped vaping for >1 day because you were trying to quit?’ (n=338).

  • ‡‡Vaping onset during versus after high schools based on responses to ever e-cigarette use questions in survey waves administered when cohort was in high school (n=329).

  • §§Mean (SD) and b’s from linear regression models shown.

  • ¶¶Number of past 30-day vaping days. Responses (‘0’, ‘1–2’ (recoded=1.5), ‘3–5’ (recoded=4), ‘6–9’ (recoded=7.5), ‘10–19’ (recoded=14.5), ‘20–29’ (recoded=24.5) or ‘30’ (recoded=30) times (range: 0–30)).

  • ***‘In the past 30 days, on the days you vaped nicotine, how many times did you usually pick up your e-cigarette device to vape?’. Responses (‘0’, ‘1’, ‘2’, ‘3–5’ (recoded=4), ‘6–9’ (recoded=7.5), ‘10–14’ (recoded=12), ‘15–20’ (recoded=17.5) or ‘>20’ (recoded=20) times (range: 0–20)) (n=341).

  • †††‘In the past 30 days, each time you picked up your e-cigarette to vape, how many puffs did you usually take before putting it away?’ (‘0’, ‘1’, ‘2’, ‘3–5‘ (recoded=4), ‘6–9‘ (recoded=7.5), ‘10–14‘ (recoded=12), ‘15–20’ (recoded=17.5) or ‘>20’ (recoded=20) times; range: (0–20)) (n=343).

  • b, unstandardised regression weight; CI, Confidence Interval; OR, Odds Ratio.