By analyzing arsenic (As3+) levels in soils and the data of cancer registries and statistics, recent studies by Putila and Guo revealed a correlation between the sediment levels of As3+ and human lung cancer, and concluded that soil As3+ contributes to more than 5,000 lung cancer cases annually in the US .
Referencia/reference: Putila JJ and Guo NL. Association of arsenic exposure with lung cancer incidence rates in the United States. PLoS One. 2011; 6(10):e25886.