Table 3.

Poisson regression summary table of rate ratios (RR) for effects of vaping and smoking frequencies on respiratory symptoms stratified by smoking status^a, Canada, 2020–2021

	Non-smokers only	Ever smokers only	Daily smokers only	All participants	Among current vapers (device type analysis)
	RR (95% CI)	RR (95% CI)	RR (95% CI)	RR (95% CI)	RR (95% CI)
Pack-equivalent yearsb	11.36 (4.61–28.00)***	2.79 (1.69–4.61)***	0.84 (0.23–3.11)***	2.29 (1.41–371)***	2.20 (1.34–3.61)**
Smoking status
Ever smoker (Ref.)
Daily smoker				1.47 (1.24–1.73)***	1.53 (1.29-1.82)
Never smoker				0.68 (0.61–0.76)***	0.75 (0.66–0.85)***
Interactions
Daily smoker X pack-equivalent years				0.41 (0.11–1.55)	0.37 (0.66–0.85)
Never smoker X pack-equivalent years				4.26 (1.62–11.20)**	3.10 (1.11–8.72)
Device type
Cig-a-like device					1.03 (0.86–1.24)
Pod type device					1.25 (1.08–1.45)**
N	1445	1059	156	2660	1795

^aAll analysis show exponentiated coefficients after adjustment for respondent age, sex, education level, marital status, parental status, registration date, other daily drug use, province, and race; those who reported a diagnosis of asthma are excluded. Full tables with covariates available in (Supplementary file Table 1).

^bPack-equivalent years is calculated as the number of reported puffs per day on days vaped (divided by 10, the standard number of puffs in a cigarette), multiplied by the number of days vaped per month (divided by 30 to provide an average daily use), then divided by 20 to convert to packs (20 cigarettes per pack) and finally multiplied by the number of years of vaping self-report (current age – age at when first started vaping).

^*p<0.05.

^**p<0.01.

^***p<0.001.