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By David Heath, Center for Public Integrity 

The low doses of arsenic similar to what many Americans consume in their drinking water are enough to develop tumors in mice, a new NIH study has found.

The low doses of arsenic similar to what many Americans consume in their drinking water are enough to develop tumors in mice, a new NIH study has found.

Researchers at the National Institutes of Health fed mice very low doses of arsenic and were surprised to find that many of them developed lung cancer, according to a study just published.

What made the results so surprising was that in previous studies, mice were fed extremely high doses of arsenic before they developed excess tumors. In the new study, mice fed lower doses of arsenic were more likely to develop tumors. The lowest dose is similar to amounts some people with private wells in the United States drink.