Smoking dose | RR |
---|---|
Non-smokers or never smoked daily | 1 |
≤10 pack-years in the past | 3 |
>10 pack-years in the past | 10 |
Non-daily smoker | 1.5 |
Current daily smoker | Age <40 | Age 40–59 | Age ≥60 |
---|---|---|---|
Started before age 20 | |||
<10 cigarettes/day | 2.3 | 4.2 | 6.1 |
10–19 cigarettes/day | 4.5 | 8.2 | 11.9 |
≥20 cigarettes/day | 7.9 | 14.3 | 20.8 |
Started after age 20 | |||
<10 cigarettes/day | 1.7 | 3.0 | 4.4 |
10–19 cigarettes/day | 3.2 | 5.8 | 8.5 |
≥20 cigarettes/day | 5.7 | 10.2 | 14.8 |