Arsenic is an extremely potent carcinogen and toxic to vital organs such as the liver, skin, kidney, and cardiovascular system. A common pathway of human exposure is through drinking water. Previous studies that assessed the long-term exposure to arsenic in drinking water have lacked resolution and rely too heavily on retrospective analysis. However, a 10-year study in Bangladesh has been released recently, and promises to be the definitive study to determine the long-term effects of arsenic exposure.