By the inhalation route, the primary tumor types are respiratory system cancers, although a few reports have noted increased incidence of tumors at other sites, including the liver, skin, and digestive tract [39]. The mean arsenic urine concentration of 40 mg/L detected in urine samples from paint factory workers was 20 times higher than that found in nonfactory workers (2 mg/L). The urinary excretion of arsenic appears to account for 30e60% of the inhaled dose [42];