Table 3.
Time-dependent smoking intensity variable (cigarettes smoked per day = CPD) by wave
| Wave 1 | |||
|---|---|---|---|
| Mean cigarettes per day (CPD) | 95% CI | n | |
| Exclusive cigarette use | 1.73 | [1.15, 2.32] | 132 |
| Dual use of cigarettes + ENDS or ENDS + OC | 1.85 | [0.87, 2.82] | 64 |
| Dual use of cigarettes + OC | 1.62 | [0.87, 2.38] | 48 |
| Polyuse of cigarettes + ENDS + OC | 2.38 | [1.12, 3.64] | 43 |
| Wave 2 | |||
| Exclusive cigarette use | 1.86 | [1.04, 2.69] | 111 |
| Dual use of cigarettes + ENDS or ENDS + OC | 1.62 | [0.76, 2.49] | 59 |
| Dual use of cigarettes + OC | 3.71 | [2.30, 5.12] | 40 |
| Polyuse of cigarettes + ENDS + OC | 0.96 | [0.30, 1.62] | 22 |
| Wave 3 | |||
| Exclusive cigarette use | 1.61 | [0.86, 2.36] | 70 |
| Dual use of cigarettes + ENDS or ENDS + OC | 2.19 | [0.84, 3.54] | 54 |
| Dual use of cigarettes + OC | 2.49 | [1.12, 3.86] | 27 |
| Polyuse of cigarettes + ENDS + OC | 2.43 | [0.88, 3.99] | 16 |
| Wave 4 | |||
| Exclusive cigarette use | 1.20 | [0.68, 1.72] | 99 |
| Dual use of cigarettes + ENDS or ENDS + OC | 0.52 | [0.21, 0.82] | 64 |
| Dual use of cigarettes + OC | 2.68 | [0.08, 5.28] | 19 |
| Polyuse of cigarettes + ENDS + OC | 1.32 | [0.69, 1.95] | 21 |
| Wave 4.5 | |||
| Exclusive cigarette use | 1.11 | [0.53, 1.69] | 75 |
| Dual use of cigarettes + ENDS or ENDS + OC | 0.74 | [0.20, 1.29] | 72 |
| Dual use of cigarettes + OC | 3.30 | [0.83, 5.76] | 19 |
| Polyuse of cigarettes + ENDS + OC | 1.60 | [0.24, 2.96] | 25 |