Stopping use of E-cigarettes and smoking combustible cigarettes: findings from a large longitudinal digital smoking cessation intervention study in the United States

Table 3 Comparison of six-month quitting smoking across e-cigarette user groups

	Non-users^a (n = 621)	Recently Started Users (n = 60)	Sustained Users (n = 187)	Recently Stopped Users (n = 122)
Quit smoking^b***
Complete Cases n/N (%)
Yes	135 (35.6%)	15 (25.0%)	40 (40.4%)	69 (56.6%)***
No	244 (64.4%)	45 (75.0%)	59 (59.6%)	53 (43.4%)
Missing = Smoking ^c
n/N (%)	242 (39.0%)	0 (0.0%)	88 (46.6%)	(0.0%)

Notes: The percentages of quit smoking responses were reported based on the total complete cases. Overall chi-square test results of the e-cigarette user group and quit smoking were statistically significant. P-values represent statistically significant differences between the left column (non-users) and each column (recently started users, sustained users, and recently stopped users). Due to attrition, quit outcomes of n = 330 participants are missing (completion rate at the follow-up was 66.7%)
^a Indicates the reference group for comparison
^b Quit smoking was assessed by reverse coding responses to the question on “Do you currently smoke cigarettes?”
^c Indicates missing data for six-month quit outcomes due to sample attrition. *p < 0.05, **p < 0.01, ***p < 0.001

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