Table 2.

The associations between smoking combustible cigarettes, using electronic cigarettes, and the risk of incident respiratory symptoms in a sample of adults from 2015 to 2020.

	Model 1♭	Model 2¶	Model 3♮
Non-users	1.00	1.00	1.00
Combustible cigarette users	1.17(1.03–1.32)	1.19(1.01–1.35)	1.23(1.03–1.43)
EC users	1.26(0.99–1.53)	1.23(0.98–1.48)	1.28(1.01–1.55)
Dual users	1.46(1.27–1.68)	1.43(1.20–1.67)	1.41(1.19–1.61)
p-value	< 0.001	< 0.001	< 0.001

Non-users: individuals who never consumed any cigarette products; Dual users: individuals who concurrently engage in the consumption of both electronic cigarettes and combustible cigarettes.

Significant values are in [bold].

EC, electric cigarette.

^♭Model 1: Unadjusted OR with 95% CI.

^¶Model 2: Adjusted for the age, gender, education level, drinking status and married status.

^♮Model 3: Adjusted for the age, gender, education level, drinking status and married status as well as values of physical measurement.