Gastric cancer is frequent in Iceland, where it accounts for about 45% of all cancers in males in death certificates and 35% of all male cancers in autopsies. Smoked meat and fish is eaten in considerable amounts in Iceland, and in rural areas these foods are kept in smokehouses for prolonged periods. Analyses for polycyclic hydrocarbons demonstrated low but significant amounts of 3,4benzpyrene in smoked mutton and trout, especially in food smoked on farms. When smoked mutton was fed to 45 laboratory rats it produced malignant tumors in 5; smoked trout had the same effect in 6 out of 18 rats. The geographical distribution of the disease can be explained to a certain extent by the greater consumption of smoked trout and salmon around rivers and lakes.
Dungal N. The Special Problem of Stomach Cancer in Iceland: With Particular Reference to Dietary Factors. JAMA. 1961;178(8):789–798. doi:10.1001/jama.1961.03040470005002
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