Matt Snodderly / Shutterstock.com In California, it seems you're never far from a reminder about cancer. You can't park a car indoors in the Golden State without seeing a warning about the ways your cancer risk might spike. Earlier this week, a California judge ordered that all coffee sellers in the state must post warnings about the potentially cancer-causing effects of a chemical in coffee called acrylamide. Acrylamide occurs naturally in small quantities when coffee beans — and many other plant-derived foods — are roasted, though research suggests the health benefits of drinking coffee vastly outweigh the risks. California's warning rule comes from a 1986 state law called Proposition 65, which was enacted to protect California's drinking water supply from toxic, potentially cancer-causing chemicals.