Once upon a time, epidemiologists believed bacon caused cancer, as did hot tea, a weedkiller that acts on no human biology, bread, apples, lettuce, mustard, tomatoes, and more. That faraway time was actually last year. You name it, and it is possible for statisticians at the International Agency for Research on Cancer (IARC) to find a chemical in it that links it to cancer. With most foods, it is also possible for other epidemiologists to link them to prevention of cancer.(1)
What did epidemiologists once deny causes cancer? The cancer history of your family - genetics.