Similar lawsuits are pending in federal court in Kansas, Massachusetts and New Jersey, and in state court in Florida and California. The parents want companies to change drink formulas and refund money spent on the beverages. Plaintiffs added Coke's Vault Zero energy drink to the Kansas lawsuit, which also targets PepsiCo Inc.'s Diet Wild Cherry and Kraft Food Inc.'s Crystal Light Sunrise Classic Orange. Benzene can form in soft drinks containing vitamin C, also called ascorbic acid, and either sodium benzoate or potassium benzoate. Scientists say heat or light exposure can trigger a reaction that forms benzene in the beverages. According to the suits, independent laboratories found benzene in the drinks at levels above the federal limit allowed in drinking water. The FDA got similar results and promised more tests.