研究者称氯处理过的水的副产品三卤甲烷（THM)，是一种致癌化学物，会增加患疾病风险。
Researchers say cancer-causing chemicals called trihalomethanes (THM) are created as a byproduct of chlorinating water and increase the risk of the disease developing.
研究对象的香烟中添加了一种多环芳烃化合物，该物质进入人体后被转化为另一种破坏dna的致癌化学物质。
A PAH was added to the subject's cigarettes, which was then modified by the body and turned into another chemical which damages DNA and has been linked with cancer.
他的团队在每天吸半包烟的出租车车内发现了几种化学物质，包括一种叫做NNK的致癌物。
His team found several chemicals on the inside of the cab of a half-pack-a-day smoker's truck, including a carcinogen called a NNK.
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