Table 1c

Weighted Percentage of Tobacco and Product-Specific Initiation at W3 Among W2 Never Users

W2 (2014/15)W3 (2015/16)
P12M InitiationP30D InitiationFrequent P30D Initiation
YouthWeighted %95%CIWeighted %95%CIWeighted %95%CI
Never tobacco use 8.9 (8.3-9.6) 3.6 (3.1-4.0) 0.6 (0.5-0.8)
Never cigarette use4.2a,b,d (3.8-4.6)1.9a,b,d (1.6-2.3)0.2b,c (0.2-0.3)
Never ENDS* use6.5a,e,f,g (6.0-7.1)2.7a,e,f,g (2.3-3.1)0.4e,f,g (0.3-0.6)
Never hookah use2.6b,e,h,i (2.4-3.0)0.9b,e,h (0.7-1.1)0.1†b,e (0.0-0.1)
Never cigar use3.6f,h,j (3.2-4.0)1.5f,h,j (1.3-1.8)0.0†c,f,j (0.0-0.1)
Never smokeless use1.7d,g,i,j (1.5-2.0)0.7d,g,j (0.6-0.9)0.2g,j (0.1-0.3)
Young adults Weighted % 95%CI Weighted % 95%CI Weighted % 95%CI
Never tobacco use 11.4 (9.5-13.6) 6.3 (5.1-7.8) 0.6 (0.3-1.0)
Never cigarette use5.3d (4.6-6.2)3.0d (2.4-3.6)0.4†(0.2-0.8)
Never ENDS use6.2g (5.5-7.1)3.6g (2.9-4.4)0.2†(0.1-0.5)
Never hookah use6.3i (5.3-7.5)2.4i (1.9-3.2)0.1†(0.0-0.2)
Never cigar use5.8j (5.1-6.6)3.6j (3.0-4.4)0.2†(0.1-0.4)
Never smokeless use1.4d,g,i,j (1.1-1.8)0.8d,g,i,j (0.6-1.1)0.1†(0.1-0.3)
Adults 25+ Weighted % 95%CI Weighted % 95%CI Weighted % 95%CI
Never tobacco use 1.8 (1.2-2.8) 1.3 (0.7-2.2) 0.2† (0.0-0.6)
Never cigarette use1.2d (0.8-1.8)0.9(0.5-1.6)0.2†(0.1-0.5)
Never ENDS use1.4e,g (1.2-1.6)0.9e,g (0.8-1.1)0.2e,g (0.1-0.2)
Never hookah use0.6e,h (0.4-0.8)0.3e,h (0.2-0.5)0.0†e (0.0-0.0)
Never cigar use1.4h,j (1.1-1.7)0.9h,j (0.7-1.1)0.2†(0.1-0.3)
Never smokeless use0.4d,g,j (0.3-0.5)0.3g,j (0.2-0.4)0.0†g (0.0-0.1)

  • W2 total group unweighted denominators (P12M initiation/P30D initiation/Frequent P30D initiation):

  • Never tobacco use – youth (ages 12-17): 8,087/8,064/8,039; young adults (ages 18-24): 1,680/1,683/1,669; adults 25+ (ages 25 and older): 2,111/2,116/2,111

  • Never cigarette use - youth: 9,954/9,950/9,945; young adults: 2,985/2,986/2,979; adults 25+: 3,083/3,085/3,081

  • Never ENDS use - youth: 9,651/9,643/9,629; young adults: 3,715/3,716/3,701; adults 25+: 10,870/10,879/10,836

  • Never hookah use - youth: 10,520/10,520/10,507; young adults: 3,395/3,397/3,394; adults 25+: 13,221/13,228/13,216

  • Never cigar use - youth: 10,267/10,251/10,241; young adults: 3,377/3,380/3,349; adults 25+: 7,570/7,579/7,548

  • Never smokeless use - youth: 10,497/10,496/10,490; young adults: 5,825/5,829/5,819; adults 25+: 13,749/13,771/13,741

  • Analysis included youth, young adult, and adult 25+ W2 never tobacco or tobacco product users with data at W2 and W3. Respondent age was calculated based on age at W2. W3 longitudinal (all-waves) weights were used to calculate estimates.

  • Never tobacco/product initiation is defined as not having used any tobacco or the specific product, even once or twice in lifetime.

  • 1) P12M initiation: Defined as a never user at W2 who used any tobacco or the specific product within the past 12 months at W3.

  • 2) P30D initiation (a subset of P12M initiation): Defined as a never user at W2 who used any tobacco or the specific product within the past 30 days at W3.

  • 3) Frequent P30D initiation (a subset of P30D initiation): Defined as a never user at W2 who used any tobacco or the specific product within the past 30 days on at least 20 or more days at W3.

  • All significance tests were done between product initiations only (not any tobacco initation).

  • adenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between cigarette and ENDS

  • bdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between cigarette and hookah

  • cdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between cigarette and cigar

  • ddenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between cigarette and smokeless

  • edenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between ENDS and hookah

  • fdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between ENDS and cigar

  • gdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between ENDS and smokeless

  • hdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between hookah and cigar

  • idenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between hookah and smokeless

  • jdenotes significant difference at p<0.005 (Bonferroni corrected for ten comparisons) between cigar and smokeless

  • *Respondents were asked about “e-cigarettes” at Wave 1 and “e-products” (i.e., e-cigarettes, e-cigars, e-pipes, and e-hookah) at W2 and W3.

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

  • †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%.

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

  • CI, confidence interval; ENDS, electronic nicotine delivery system; P30D, past 30-day; P12M, past 12-month; W1, Wave 1; W2, Wave 2; W3, Wave 3.