Baseline data of participants and self-reported quitting method (n=684)
| Characteristics | Control n (%) | Intervention n (%) | Total n (%) |
| Age (mean (SD)) (years) | 28.8 (9.8) | 27.9 (10.2) | 28.3 (10.0) |
| Sex | |||
| Female | 181 (52.9) | 195 (57.0) | 376 (55.0) |
| Male | 161 (47.1) | 147 (43.0) | 308 (45.0) |
| Country | |||
| Australia | 84 (24.6) | 89 (26.0) | 173 (25.3) |
| Singapore | 87 (25.4) | 79 (23.1) | 166 (24.3) |
| UK | 83 (24.3) | 88 (25.7) | 171 (25.0) |
| USA | 88 (25.7) | 86 (25.1) | 174 (25.4) |
| Education | |||
| Graduate level or above | 188 (55.0) | 179 (52.3) | 367 (53.7) |
| Less than graduate level | 154 (45.0) | 163 (47.7) | 317 (46.3) |
| Income level | |||
| Less than US $20 K/year | 111 (32.5) | 104 (30.4) | 215 (31.4) |
| US$21– 49 K/y ear | 168 (49.1) | 164 (48.0) | 332 (48.5) |
| More than US$50 K/year | 63 (18.4) | 74 (21.6) | 137 (20.0) |
| Marital status | |||
| Married or de facto | 100 (29.2) | 95 (27.8) | 195 (28.5) |
| Others (single, widowed, etc) | 242 (70.8) | 247 (72.2) | 489 (71.5) |
| Nicotine dependency (Fagerström) | |||
| Very low–low (0–4) | 163 (47.7) | 176 (51.5) | 339 (49.6) |
| Medium (5) | 50 (14.6) | 44 (12.9) | 94 (13.7) |
| High–very high (6–10) | 129 (37.7) | 122 (35.7) | 251 (36.7) |
| Selected quitting method | |||
| No treatment used (unassisted) | 124 (36.3) | 102 (29.8) | 226 (33.0) |
| Any NRT | 58 (17.0) | 53 (15.5) | 111 (16.2) |
| Self-help materials in the app | 15 (4.4) | 56 (16.4) | 71 (10.4) |
| Other self- help | 25 (7.3) | 32 (9.4) | 57 (8.3) |
| Aversion therapy | 20 (5.8) | 21 (6.1) | 41 (6.0) |
| Herbal therapy | 22 (6.4) | 19 (5.6) | 41 (6.0) |
| Acupuncture | 22 (6.4) | 13 (3.8) | 35 (5.1) |
| Hypnosis | 10 (2.9) | 20 (5.8) | 30 (4.4) |
| Varenicline | 9 (2.6) | 0 (0) | 9 (1.3) |
| Bupropion | 0 (0) | 4 (1.2) | 4 (0.6) |
| Others | 37 (10.8) | 22 (6.4) | 59 (8.6) |
app, application; NRT, nicotine replacement therapy.