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。
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).
罹患ALS的风险性也与吸烟的数量相关（日吸烟量和年吸烟量）。
The team found that men with higher scores on the lifetime alcohol problems scale (LAPS) and those who reported a higher number of pack-years of smoking both had lower IQ scores.
研究小组发现在终生饮酒问题表上得分较高的和那些年吸烟量越高的人，他们的智商往往比较低。
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