“…Their conclusions, presented in Table 1, indicate that environmental pollution is responsible for a relatively small percentage of cancer deaths in the U.S., in the range of 1 to 5 percent. Because of the difficulty of isolating interactive causes, these estimates are controversial with other researchers reporting significantly higher percentages of cancer attributable to environmental contaminants (Barth and Hunt, 1980;Epstein, 1979). A recent comprehensive survey of epidemiological studies by Ames, Magaw, and Gold (1987) suggests that the threat of cancer from various environmental exposures to pollution is substantially less than exposures to many natural sources such as peanut butter (carcinogenic risk from aflatoxins), raw mushrooms (hydrazines), and wine (ethyl alcohol) (see also Crouch and Wilson, 1982, pp.…”