Table 3.

The examination of quit smoking attempts and quitting smoking as a function of vaping status and frequency

Vaping status between baseline and follow-up	Quit attempt		Quit smoking among, smokers who made a quit attempt (n=1690)		Quit smoking (overall)
	n	%	n	%	n	%
Overall (N=4612)	1690	36.9%	485	28.3%	485	10.5%
Model 1
Did not initiate vaping* (n=3745)	1267	36.3%	351	27.3%	351	9.8%
Initiated vaping after baseline (≥ monthly) (n=867)	406	45.0%	126	32.3%	126	15.7%
p-value		<0.001		0.16		<0.001
aOR (95% CI) for any vaping vs. no vaping		1.60 (1.25 - 2.06)		1.30 (0.91- 1.86)		1.76 (1.27- 2.44)
Model 2
Did not initiate vaping* (n=3745)	1267	36.3%	351	27.1%	351	9.8%
Initiated any daily vaping† (n=456)	249	53.8%	106	40.6%	106	23.4%
p-value		<0.001		0.001		<0.001
aOR (95% CI) for daily vaping vs. no vaping		2.52 (1.83 - 3.47)		1.95 (1.29 - 2.94)		3.00 (2.08 - 4.33)
Initiated any non-daily vaping† (n=411)	157	34.9%	20	16.7%	20	6.3%
p-value		0.69		0.053		0.11
aOR (95% CI) for non-daily vaping vs. no vaping		0.93 (0.64 −1.34)		0.51 (0.26 - 1.01)		0.61 (0.33 - 1.11)

Estimates for each outcome are weighted and adjusted for age, sex, country of residence, education, income, cigarette dependence, plans to quit smoking, quit attempt prior to baseline, TIS, wave of recruitment, and NRT use at follow-up. Vaping status between baseline and follow-up: the outcome takes into account the frequency of vaping between surveys and at follow-up.

^†Sample includes anyone who vaped daily/non-daily between surveys, as well as at their follow-up measure.

^*Reference group: includes those who vape less than monthly or not at all; ‘n’ are the number of observations in the models for each outcome and are not the number of unique respondents in the sample. Bolded statistics denote statistical significance.