Some time ago (days, years, decades?) I read a story where the fertilizer that was being applied to tobacco plants was being blamed as the root cause of cancer for smokers. The idea was that the fertilizer contained radioactive lead (!?), it was absorbed by the plant, and lodged in the lungs when the leaves were smoked. To support this theory, they had mapped the radiation deposits (using some sort of imaging process) in smokers lungs and found that they had much higher levels of radiation than non-smokers. So the problem wasn't the tobacco at all, but the fertilizer the growers were using. Now I find this report that asserts something similar. It does not mention fertilizer, but I suspect that just means the secret organization that really runs things still has some power to suppress the truth (grin).
http://www.newscientist.com/article.ns?id=dn11974&feedId=online-news_rss20
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