[steve86]

I lean more to suspecting some unspecified food additive. It doesn’t have to be just in the last decade as a pre-cancerous condition could develop over many years previous. Or an industrial effluent in the atmosphere, etc. If the trend could be narrowed down to a given geographic area the latter possibility would be more likely.

[TTFX]

I lean more to suspecting some unspecified food additive.

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Nixon told the government to add retinol to skim milk in 1978.