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. 2020 Sep 27;17(19):7084. doi: 10.3390/ijerph17197084

Table 3.

User group transitions in smoking and vaping among daily smokers, non-daily smokers, and recent ex-smokers.

Wave 1 Wave 2
Smoking Not Smoking
Exclusive Smoking Concurrent Use Total Smoking
Exclusive Daily Smokers
(1)
Exclusive Non-Daily Smokers
(2)
Dual-Daily Users
(3)
Predominant Smokers
(4)
Predominant Vapers and Concurrent Non-Daily Users *
(5 + 6)
Total Daily Smokers
(1 + 3 + 4)
Total Non-Daily Smokers
(2 + 5 + 6)
Ex-Smokers Who Vape
(7)
Ex-Smokers Not Vaping
(8)
Total Discontinued Smoking
(7 + 8)
Exclusive smokers (n = 3319)
1 Exclusive daily smokers (n = 3063) % 71.4 3.0 3.7 8.9 1.5 84.0 4.5 2.6 9.0 11.6
n 2296 79 94 223 37 2613 116 73 261 334
2 Exclusive non-daily smokers (n = 256) % 21.1 31.2 4.2 8.0 8.4 33.3 39.6 4.8 22.5 27.3
n 55 84 7 16 22 78 106 11 61 72
Concurrent users (n = 1117)
3 Dual-daily users (n = 322) % 21.4 1.5 38.5 18.6 8.3 78.5 9.8 9.5 2.2 11.7
n 46 3 129 76 34 251 37 25 9 34
4 Predominant smokers (n = 598) % 42.2 2.7 14.9 25.4 5.4 82.5 8.1 5.0 4.5 9.5
n 216 16 89 187 40 492 56 26 24 50
5 Predominant vapers (n = 88) % 4.2 1.7 12.0 18.7 39.7 34.9 41.4 18.0 5.8 23.8
n 6 3 17 12 29 35 32 15 6 21
6 Concurrent non-daily users (n = 109) % 5.3 9.9 7.1 9.0 51.2 21.4 61.1 8.2 9.4 17.6
n 6 8 10 15 48 31 56 10 12 22
Recent ex-smokers (n = 580)
Relapsed (exclusive smoking or concurrent use) Continued smoking abstinence
7 Ex-smokers who vape (n = 136) % 4.4 (1 + 2) 8.1 (3 − 6) 12.5 (1 − 6) 67.3 20.2 87.5
n 2 8 10 94 32 126
8 Ex-smokers not vaping (n = 444) % 11.3 (1 + 2) 2.0 (3 − 6) 13.3 (1 − 6) 4.6 82.1 86.7
n 47 8 55 21 368 389
Row Totals
  All daily smokers (n = 3983) % 67.2 2.9 5.8 10.6 2.1 83.6 5.0 2.9 8.4 11.3
  All non-daily smokers (n = 453) % 17.7 26.1 5.5 9.2 15.5 32.4 41.6 6.5 19.6 26.1
  All recent ex-smokers (n = 580) % 10.5 (1 + 2) 2.8 (3 − 6) 13.3 (1 − 6) 12.2 74.6 86.8

Data are weighted and adjusted with covariates. The numbering system (1–8) corresponds to Table 1. * Groups 5 and 6 were merged at Wave 2 due to small sample sizes; Recent ex-smokers could not be further subdivided at Wave 2 due to small sample sizes. Bold: Weighted estimates are bolded; Italics: sample sizes are italicized.