Table 1.
Participant demographics and baseline characteristics.
| n | Percentage | Mean | SD | Min. | Max. | |
|---|---|---|---|---|---|---|
| Gender | ||||||
| Male | 12 | 60 | ||||
| Female | 8 | 40 | ||||
| Age (years) | 20 | 37.90 | 10.66 | 23 | 62 | |
| Ethnicity | ||||||
| White | 19 | 95 | ||||
| Mixed‐race | 1 | 5 | ||||
| Qualification | ||||||
| GSCE‐levels | 10 | 50 | ||||
| A‐levels | 5 | 25 | ||||
| Undergraduate level (5–6) | 2 | 10 | ||||
| Post‐graduate level (7 and above) | 3 | 15 | ||||
| Occupational status | ||||||
| Employed | 14 | 70 | ||||
| Retired | 1 | 5 | ||||
| Self‐employed | 5 | 25 | ||||
| Length of time quit smoking (months) | 20 | 25.95 | 23.35 | 3 | 108 | |
| E‐cigarette addiction (0–100%) | 20 | 70.15 | 21.90 | 40 | 100 | |
| Penn State E‐cigarette Dependence Index | 20 | 12.05 | 4.02 | 4 | 20 | |
| Baseline cotinine levels (ng/ml) | 20 | 324 | 219 | 39 | 719 | |
| Baseline CO levels | 19 | 3.90 | 2.77 | 0 | 9 | |
| Daily liquid volume consumed (ml) | 16 | 6.57 | 3.10 | 1.3 | 10 | |
| Estimated puffs per day | 6 | 180 | 80 | 80 | 300 | |
| Current model most used | ||||||
| Rechargeable non‐cigalike (2nd generation) | 12 | 60 | ||||
| Modular systems (including sub‐ohms) | 8 | 40 | ||||
| Main nicotine concentration used | ||||||
| Non‐sub‐ohmers | 5 | 25 | 14.13 | 4.16 | 6 | 24 |
| Sub‐ohmers (incl daily & occasional use) | 15 | 75 | 8.40 | 4.93 | 3 | 15 |
CO = carbon monoxide; GCSE = General Certificate of Secondary Education; SD = standard deviation.