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The more serious problem with California's law is one of effect size. Health, and cancer, aren't binary. Consumers can't just be concerned with whether a danger exists; they also need to be concerned about the magnitude of that risk. Even if there's a statistically significant risk between huge quantities of coffee and some cancer (and that's not proven), it's very, very small. Cigarettes have a clear and easily measured negative impact on people's health. Acrylamide, especially the acrylamide in coffee, isn't even close. Warning labels should be applied when a danger is clear, a danger is large and a danger is avoidable. It's not clear that, with respect to acrylamide, any of these criteria are met. It's certainly not the case regarding coffee. Whatever the intentions of Proposition 65, this latest development could do more harm than good.

News stories regarding the latest in the world of medicine are often popular. After all, most people are interested in their own health and that of their family and friends. But sometimes reports can be confusing. For example, one minute coffee seems good for you, and the next it's bad for your health. And remember when 150 health experts from around the world called for the 2016 Rio Olympic Games to be cancelled or postponed because of the Zika virus? This call was swiftly opposed by both the World Health Organisation (WHO) and the Centers for Disease Control and Prevention (CDC). Sometimes these contradictions reflect differences of opinion in the scientific community, and different approaches to research. These are a normal part of the scientific process. But in other instances, health news misinforms because of the way some journalists interpret and report research findings.