Table 4 Aim 2: Associations between wave 4 frequency of e-cigarette use, device type, nicotine strength, use of NRT, time quit smoking, socio-demographics and relapse to smoking during follow-up, n = 159

Vaping status

Non-daily use

65.0

3.52

1.32

9.41

0.012

3.88

1.10

13.62

0.035

Daily use (ref)

34.5

1

1

1

Ref

1

1

1

Ref

Device type

Disposable, cartridges, unknown

41.9

3.09

1.11

8.57

0.031

2.83

0.90

8.95

0.076

Tanks

45.6

3.59

1.41

9.13

0.007

3.63

1.33

9.95

0.012

Modular (ref)

18.9

1

1

1

Ref

1

1

1

Ref

Nicotine strength

None, unknown

36.4

1.32

0.53

3.32

0.55

0.54

0.17

1.74

0.30

1 to 14 mg/ml

45.2

1.91

0.91

4.02

0.090

1.51

0.66

3.44

0.33

15 mg/ml and over (ref)

30.2

1

1

1

Ref

1

1

1

Ref

NRT use

Yes

50.0

1.71

0.64

4.58

0.29

1.25

0.41

3.80

0.70

No (ref)

36.9

1

1

1

Ref

1

1

1

Ref

Time quit smoking

2 to 12 months

64.0

4.90

2.39

10.04

< 0.001

4.62

2.11

10.09

< 0.001

> 12 months (ref)

26.6

1

1

1

Ref

1

1

1

Ref

Gender

Male

38.2

0.99

0.52

1.87

0.96

Female (ref)

38.6

1

1

1

Ref

Age

Per year increase

41.7

0.98

0.96

1.00

0.068

Income

Not disclosed, low, moderate

35.1

0.70

0.36

1.34

0.28

High (ref)

43.5

1

1

1

Ref