“It is estimated that two of every 10 cancers are due to environmental causes, according to Toriola. More than 100 environmental factors have been classified capable of causing cancer in humans, according to Toriola. Some of the risk factors are well-known, such as radiation exposure from CT scans, asbestos and industrial solvents like benzene, according to Hu. “While some of these factors have a predilection for causing cancer in specific sites, others may affect more than one site,” Toriola says. He singles out arsenic (found in wood preservatives and pesticides), which is associated with an increased risk of skin, lung, bladder and kidney cancers; and cadmium (found in metal coatings and some plastics), which appears to be associated with lung cancer.”