回复：一年才抽30合香烟就要CT筛查了，一天平均一根多，这么少的吸烟量，也会导致肺癌？

来源: 于 2013-07-31 09:28:14 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

One pack-year of smoking would mean that someone had smoked one package of cigarettes (20 cigarettes) daily for one year. TBz is right