The industry and its apologists hide behind an argument based on something called etiology. Their argument goes something like this: because we know that many things (possibly thousands) might contribute to the formation of cancer cells, it is impossible to blame one thing (i.e. the cigarette), so long as even one of these other so-called confounding factors is also present. You can never be certain, they argue, which caused the cancer. Using this as a model, it is impossible to prove that banging your head against a brick wall causes headaches, so long as another co-factor (listening to Swiss
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