My friend's father has been smoking for 16 pack-years. It's no wonder he developed lung cancer at his age.
我朋友的父亲已经有16年烟龄，每天一包未曾间断。难怪在老年的时候患上了肺癌。
2
Participants had either a current or former cigarette smoking history of at least 30 pack-years, and had to be without symptoms or a history of lung cancer.
这些参与者都是现行吸烟者或至少有过30包年吸烟史的人，而且尚未出现肺癌征兆也没有肺癌历史。
3
The risk of developing ALS also increased as the number of pack-years smoked (product of the number of packs per day and the number of years that quantity was smoked).