Frequency of E-Cigarette Use and Smoking Status of U.S. Adolescents in the 2015 NYTS

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Gregory Conley

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What Was Studied



This study analyzed the frequency of e-cigarette use and its association with smoking status among U.S. adolescents.

The National Youth Tobacco Survey 2015 was analyzed in 2017, focusing on frequency of past 30-day e-cigarette use according to smoking status of participants. Smoking status was classified as never smoker, ever/not a past 30-day smoker, and past 30-day smoker. Infrequent and frequent smoking and e-cigarette use was defined as use for <20 and ≥20 of the past 30 days, respectively.

Results


Past 30-day e-cigarette use was reported by:

  • 54.5% (95% CI=47.8%, 61.0%) of past 30-day smokers
  • 26.5% (95% CI=23.2%, 30.1%) of ever/not past 30-day smokers, and
  • 4.6% (95% CI=4.0%, 5.2%) of never smokers (p<0.001).

No past 30-day e-cigarette use was reported by 94.5% of never smokers.

Past 30-day e-cigarette use was reported by 50.4% (95% CI=43.6%, 57.3%) of infrequent and 64.7% (95% CI=54.4%, 73.8%) of frequent past 30-day smokers (p<0.001).

Frequent e-cigarette use was reported by 0.3% of never smokers.

E-cigarette use frequency correlated with both smoking status and tobacco cigarette consumption (ρ=0.42, p<0.001 and ρ=0.40, p<0.001, respectively). Past 30-day smokers were more likely to report past 30-day e-cigarette use (OR=11.42, 95% CI=9.06, 14.40) compared with adolescents reporting no past 30-day smoking.

This study also found:

  • frequent smokers were approx. 84 times more likely than never smokers to vape daily (16.9% v 0.2%)
  • infrequent smokers were approx. 36 times more likely than never smokers to vape daily (7.3% v 0.2%)
  • frequent smokers were approx. 73 times more likely than never smokers to vape frequently (21.8% v 0.3%)
  • infrequent smokers were approx. 41 times more likely than never smokers to vape frequently (12.2% vs 0.3%)
  • frequent smokers were approx. 12 times more likely than never smokers to vape in past 30 days (64.7% v 5.5%)
  • infrequent smokers were approx. 9 times more likely than never smokers to vape in past 30 days (50.4% v 5.5%)
Author’s Conclusions


E-cigarette use is more prevalent among ever and past 30-day smoking adolescents compared with never smoking adolescents. Frequent e-cigarette use is rare among never smoking adolescents.


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