Variable

Baseline

n = 36

Week 4

n = 30

p-value

Week 8

n = 26

p-value

Smoking Characteristics

No smoking, past 30 days (%)

-

3 (10.0)c

-

6 (23.1)d

-

Number days smoking, past 30 days (SD)

29.77 (0.96)

17.45 (12.84)

<0.001

16.88 (13.01)

<0.001

Ave cpd, past 30 days (SD)

14.85 (6.05)

6.01 (5.71)

<0.001

6.36 (6.15)

<0.001

No smoking, past 7 days (%)

-

8 (26.7)e

-

6 (23.1)f

-

Ave cpd, past 7 days (SD)

14.57 (6.10)

5.23 (5.91)

<0.001

5.99 (6.41)

<0.001

Vaping Characteristics

No vaping, past 30 days (%)

36 (100.0)

-

-

1 (4.0)

-

Number of days vaping, past 30 days (SD)a

-

27.74 (4.79)

-

24.56 (9.20)

0.108

Ave e-cig uses, past 30 days (SD)a

-

21.81 (28.68)

-

13.00 (17.64)

0.615

No vaping, past 7 days (%)

36 (100.00)

-

-

1 (4.0)

-

Ave e-cig uses, past 7 days (SD)a

-

23.83 (31.63)

11.75 (17.97)

<0.001

Cotinine (SD)

230.58 (223.13)

200.86 (232.19)

0.389

188.34 (186.59)

0.387

Psychological Characteristics

Importance (SD)

8.76 (1.64)

8.59 (2.09)

0.620

8.46 (2.56)

0.172

Confidence (SD)

6.52 (2.95)

7.55 (2.44)

0.108

7.08 (2.50)

0.331

Quit attempt, past 12 months (%)

14 (38.9)

-

-

-

-

Quit attempt, past 4 weeks (%)

-

23 (76.7)

-

15 (57.7)

-

Number quit attempts, past 4 weeks (SD)a

-

2.46 (4.30)

-

2.57 (4.62)

0.674

Symptoms, N (%) indicating “better” rather than “same”

Since starting to use the e-cigarette, do you feel your health is:

-

15 (50.0)

-

17 (65.4)

-

If you had a smoker’s cough before using the e-cigarette, is it now:

-

15 (50.0)

-

15 (57.7)

-

How has your ability to exercise changed since using the e-cigarette?

-

9 (30.0)

-

12 (46.2)

-

How has your sense of smell changed since using the e-cigarette?b

-

16 (53.3)

-

14 (53.8)

-

How has your sense of taste changed since using the e-cigarette?

-

12 (40.0)

-

13 (50.0)

-