Environment
Credit: Bart Coenders / Getty Images

Living next to a power plant or Superfund site is probably less likely to cause cancer than being overweight, but still, chemicals found in air, water, and some of the places we work have all been linked to cancer. A prime example is asbestos, a mineral fiber that was used in a whole mess of products – like textured paints, shingles, auto clutches – because it was strong and heat-resistant. Exposure to asbestos fibers can result in lung cancer or mesothelioma. With asbestos risk recognized, Colditz says environmental-related cancer risk should not be the top concern for most people these days.