Table 2. Odds (95% CI) of Being a Former Smoker (Logistic Regression).

Predictor	European Union		Great Britain
	Unadjusted	Adjusted	Unadjusted	Adjusted
	Ever nicotine-containing e-cigarette use (excluding experimenters), n	11,384	11,384	370	370
Used e-cigarette (ref=never)	0.34 (0.26, 0.43)	0.43 (0.32, 0.58)	0.33 (0.18, 0.64)	0.42 (0.20, 0.87)
Female (ref=male)		1.13 (0.98, 1.31)		1.39 (0.83, 2.33)
Cigarettes per day (per 10 cigs)		1.04 (0.96, 1.12)		1.13 (0.89, 1.44)
Age (per 10 years)		1.51 (1.43, 1.59)		1.68 (1.42, 2.00)
Education
No formal education		1.00 (ref)		1.00 (ref)
16–19 years at completion		1.23 (1.08, 1.40)		2.35 (1.27, 4.35)
≥20 years at completion		2.27 (1.82, 2.82)		4.58 (2.15, 9.77)
Still studying		2.71 (2.00, 3.69)		4.22 (0.85, 20.98)
Marital status
Married/living with partner		1.00 (ref)		1.00 (ref)
Single		0.80 (0.69, 0.93)		0.47 (0.25, 0.89)
Divorced/separated/widowed/other		0.63 (0.54, 0.72)		0.39 (0.19, 0.79)
Intensity of nicotine-containing e-cigarette use, n	12,528	12,528	408	408
Intensity of e-cigarette use
Never	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Daily use	0.42 (0.31, 0.56)	0.52 (0.36, 0.73)	0.42 (0.20, 0.84)	0.55 (0.25, 1.21)
Occasional use	0.25 (0.18, 0.35)	0.33 (0.23, 0.47)	0.15 (0.03, 0.68)	0.19 (0.04, 0.84)
Experimentation	0.24 (0.19, 0.30)	0.32 (0.25, 0.41)	0.28 (0.12, 0.66)	0.32 (0.11, 0.93)
Female (ref=male)		1.08 (0.94, 1.24)		1.20 (0.72, 1.98)
Cigarettes per day (per 10 cigs)		1.02 (0.94, 1.10)		1.04 (0.85, 1.27)
Age (per 10 years)		1.48 (1.41, 1.56)		1.57 (1.33, 1.85)
Education
No formal education		1.00 (ref)		1.00 (ref)
16–19 years at completion		1.23 (1.08, 1.40)		2.02 (1.12, 3.62)
≥20 years at completion		2.25 (1.82, 2.78)		3.56 (1.71, 7.40)
Still studying		2.87 (2.08, 3.96)		2.64 (0.59, 11.80)
Marital status
Married/living with partner		1.00 (ref)		1.00 (ref)
Single		0.80 (0.69, 0.93)		0.52 (0.28, 0.96)
Divorced/separated/widowed/other		0.64 (0.55, 0.74)		0.43 (0.23, 0.83)