carcinogens

The World Health Organization's decision puts bacon, hot dogs and sausages in the same category of cancer risk as tobacco smoking. And beef, pork, veal and lamb are "probably carcinogenic," WHO says.

A respected scientific group says that glyphosate, also known as Roundup, is "probably carcinogenic to humans." Yet the actual risks — which are mainly to farmers, not consumers — remain uncertain.

Unexpectedly high levels of the cancer-causing chemical were found in an analysis of the vapor from e-cigarettes, researchers say.