Baseline characteristics of participants by treatment groups
| Quit.ie (n=149) | AC (n=151) | |
| Female, n (%) | 68 (45.6) | 67 (44.4) |
| Age, median (IQR) | 44.0 (38.0–51.0) | 44.0 (36.0–52.0) |
| Initial weight, median (IQR), kg | 80.8 (69.0–93.9) | 79.8 (69.4–91.7) |
| Postsecondary and higher education, n (%) | 104 (69.8) | 105 (69.5) |
| Baseline CO reading, mean (SD), ppm | 20.4 (10.5) | 22.1 (11.6) |
| Time to first cigarette, n (%) | ||
| ≤5 min | 42 (28.2) | 56 (37.1) |
| 6–30 min | 66 (44.3) | 61 (40.4) |
| >31 min | 41 (27.5) | 34 (22.5) |
| Prior use of e-cigarettes, n (%) | 72 (48.3) | 75 (49.7) |
| Previous quit attempts, n (%) | ||
| None | 6 (4.2) | 4 (2.7) |
| 1–3 | 63 (43.8) | 69 (46.3) |
| 4–9 | 61 (42.4) | 59 (39.6) |
| 10 and over | 14 (9.7) | 17 (11.4) |
| No of cigarettes smoked per day, median (IQR) | 20.0 (15.0–22.0) | 20.0 (15.0–25.0) |
| How many years are you smoking, median (IQR) | 28.0 (22.0–34.0) | 26.0 (20.0–35.0) |
| Readiness to quit score, median (IQR) | 27.0 (24.5–29.0) | 27.0 (25.0–29.0) |
AC, Allen Carr’s Easyway to Stop Smoking; CO, carbon monoxide.