Table 1.
E-cigarette Session and Puffing Characteristics among Nonestablished and Established Cigarette Smokers
| Characteristic | Established cigarette Smoker, N = 14 | Nonestablished cigarette smoker, N = 6 | p-Value of F-test | |||
|---|---|---|---|---|---|---|
| % or mean | 95% CI | % or mean | 95% CI | Cohen’s d | ||
| Participant characteristic | ||||||
| Age | 19.7 | 19.5 | ||||
| Male | 92.9% | 100.0% | ||||
| White | 64.3% | 50.0% | ||||
| Non-White | 35.7% | 50.0% | ||||
| Ever smoke cigarettes | 100.0% | 83.3% | ||||
| Past 30-day e-cigarette craving | 35.7% | 16.7% | ||||
| Irritable when not using e-cigarettes | 64.3% | 16.7% | ||||
| Use e-cigarette within 30 min of waking | 35.7% | 16.7% | ||||
| Session characteristic | ||||||
| Sessions per day | 5.3 | [3.4–7.2] | 3.5 | [2.1–5.0] | .136 | 0.244 |
| Session length (s) | 566.3 | [278.9–853.7] | 279.7 | [176.7–382.7] | .064 | 0.113 |
| Total number of puffs | 13.7 | [9.4–18.0] | 11.9 | [9.1–14.7] | .481 | 0.046 |
| Volume of first puff (mL) | 130.9 | [73.9–187.9] | 56.0 | [36.3–75.6] | .018 | 0.149 |
| Total puff volume (mL) | 1509.3 | [767.4–2251.1] | 651.7 | [443.4–859.9] | .031 | 0.131 |
| Puffing characteristic | ||||||
| Puff duration | 3.3 | [2.3–4.3] | 1.8 | [1.5–2.1] | .005 | 0.048 |
| Puff interval | 38.1 | [24.7–51.4] | 21.7 | [12.1–31.4] | .052 | 0.037 |
| Puff volume (mL) | 110.3 | [10.4–150.3] | 54.7 | [41.5–67.9] | .012 | 0.042 |
| Puff flow rate (mL/s) | 26.6 | [23.1–30.1] | 30.5 | [23.3.–37.8] | .321 | −0.030 |