It's in the water

Population studies begun forty to fifty years ago show that when people migrate from one country to another, they acquire the cancer rate of the country to which they move, despite the fact their genes remain the same. This strongly indicates that at least 80 percent to 90 percent—and probably closer to 97 percent to 98 percent—of all cancers are related to diet and lifestyle, not to genes.— Whole (electronic edition), chapter 9

<idle musing>
Obviously then, as the old saying goes, "it's in the water!" : )

Actually, anymore it probably is in the water, what with agricultural runoff, fracking runoff, and the runoff from road salt. And don't forget the chemicals that leach from all that bottled water...
</idle musing>