Quote:
Originally posted by Bill O'Rights
Ten packs? In a year? That's like...what...4.2 cigarettes a week? I smoke that many on my way to the car in the morning. 
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Pack-years is a long-term measurement of smoking volume.
A pack a day for ten years is ten pack-years. Two packs a day for ten years is twenty pack-years.
I smoked roughly a pack a day from ages 16 through 26.