Most cancer types 'just bad luck'

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3. Any statistical spread

will produce a chance rating for each outcome, so the issue is hardly that causal relationships are lacking. Rather, the mechanics of the analysis will produce a chance-like understanding of projected possibilities. A Bayesian statistical approach would show an increase in risks associated with exposure to chemicals or radiation and constrain the projected spread. It remains a range, as any projection must, but given sufficient causal constraints the occurrence will trend almost to certainty. It is a chance that one might die from riding a motorcycle but the odds go up dramatically after one purchases a motor cycle and drives it in an irresponsible manner. Chance, or luck, is a result of any statistical projection and this announcement appears to undermine an environmental causality. It isn't chance, in a conventional sense, if we could responsibly do some preventative strategy to significantly reduce the projected risks.