A California woman has filed a lawsuit against PepsiCo Inc. alleging that they failed to warn consumers that their Pepsi One beverage contains high levels of a cancer-causing chemical. The lawsuit contends that the company was aware that a chemical used called 4-methylimidazole had caused cancer in lab mice, but failed to warn the public of the risks. The lawsuit seeks unspecified monetary damages and an injunction requiring PepsiCo to either lower the levels of the chemical in the drink or place a warning label on the packaging.