Tobacco smoke is hazardous because it contains a number of unhealthy chemicals, including some 60 carcinogens (cancer-causing agents), tar, arsenic, carbon monoxide and nicotine.

吸烟之所以危害健康是因为烟草中含有多种损害健康的化学物质，包括60来种致癌物质、烟碱、砷、一氧化碳和尼古丁。

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Arsenic containing compounds have been used as cancer treatment for hundreds of years.

含砷化合物用于治疗癌症已有几百年的历史。

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Here a child in Nepal drinks from a well containing water contaminated with arsenic, which can lead to abnormal heart beat, blood vessel damage and cancer, among other ill effects.

图中是尼泊尔的一个小孩从一口被砷污染的水井中汲水喝，这种水会导致心率失常，血管损坏和癌症等其他疾病反应。

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I'm going to take a look at some of the regulatory rollbacks of the Bush administration, such as the one that lowers the limit of cancer-causing arsenic in drinking water.

CNN: Lieberman: In Senate, 'nothing happens smoothly'

Apart from disfiguring the skin, after two decades arsenic poisoning has a high risk of causing fatal cancer in the lungs, liver, bladder and kidneys.

ECONOMIST: Scientists have offered a solution to the arsenic wells