-- Cited repeatedly, especially by commentators who argue that cleaning up the environment is not going to make much difference in cancer rates.
-- Convenient to industry.

-- Occupation 4% (range 2-8%)
-- Pollution 2% (range <1-5%)
-- Industrial products <1%
? Total of about 7% (being generous).

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Notes to Doll & Peto Table 20:
a Allowing for a possibly protective effect of antioxidants and other preservatives.
b See section 5.5 for intended meaning.
Only about 1%, not 3%, could reasonably be described as
“avoidable” (see text). Geophysical factors also cause a much greater proportion of non-fatal cancers (up to 30% of all cancers, depending on ethnic mix and latitude) because of the importance of UV light in causing the relatively non-fatal basal cell and squamous cell carcinomas of sunlight-exposed skin.