赫克特特别注意追踪特定的一种多环芳烃——菲，因为菲存在于香烟烟雾中。
One specific type that Hecht was particularly interested in tracking was phenanthrene, which is in cigarette smoke.
这些结果具有重要意义，因为多环芳烃二醇环氧化物极易与DNA反应，进而导致变异，因此被视为香烟烟雾中所含多种多环芳烃中最重要的致癌物质。
These results are significant because PAH diol epoxides react readily with DNA, induce mutations, and are considered to be ultimate carcinogens of multiple PAH in cigarette smoke.
烟草每年使近600万人失去生命，其中有500多万人属于烟草使用者和既往使用者，有60多万人属于接触二手烟雾的非吸烟者。
Tobacco kills nearly six million people each year, of whom more than 5 million are users and ex users and more than 600 000 are nonsmokers exposed to second-hand smoke.
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