Longitudinal Patterns of Use of E-cigarette Products (χ2 Test for Independence)
| Characteristics of E-cigarettes Used at Wave 1 . | Wave 2: No Longer a Past 30-d Regular User, % . | Wave 2: Closed Systems, % . | Wave 2: Open Systems, % . |
|---|---|---|---|
| Disposable | Rechargeable | ||
| Disposable (n = 49) | 68.6 | 2.0 | 29.4 |
| Rechargeable (n = 111) | 68.4 | 4.5 | 27.2 |
| Cartridge | No cartridge | ||
| Uses a cartridge (n = 50) | 75.7 | 0.0 | 24.3 |
| Does not use a cartridge (n = 103) | 64.0 | 2.4 | 33.5 |
| Not refillable | Refillable | ||
| Refillable (n = 61) | 72.6 | 1.4 | 26.0 |
| Not refillable (n = 97) | 61.4 | 4.7 | 33.9 |
| Characteristics of E-cigarettes Used at Wave 1 . | Wave 2: No Longer a Past 30-d Regular User, % . | Wave 2: Closed Systems, % . | Wave 2: Open Systems, % . |
|---|---|---|---|
| Disposable | Rechargeable | ||
| Disposable (n = 49) | 68.6 | 2.0 | 29.4 |
| Rechargeable (n = 111) | 68.4 | 4.5 | 27.2 |
| Cartridge | No cartridge | ||
| Uses a cartridge (n = 50) | 75.7 | 0.0 | 24.3 |
| Does not use a cartridge (n = 103) | 64.0 | 2.4 | 33.5 |
| Not refillable | Refillable | ||
| Refillable (n = 61) | 72.6 | 1.4 | 26.0 |
| Not refillable (n = 97) | 61.4 | 4.7 | 33.9 |
No tests were statistically significant.