A new study discovered a cancer-causing chemical is still being used to make Coca-Cola in some states.
The company reduced its use of caramel coloring after it was linked to cancer. However, a food safety group measured the chemical in Coke all over the world and found 144 micrograms of it in Coke purchased in Washington. The group only found four micrograms of the chemical in bottles from California.
California recently required soda makers to include a cancer warning label if it used the chemical.
"The major maker of caramel coloring in the United States says it can manufacture caramel coloring without any carcinogen but that it costs four times as much and companies don't want to use it," said Michael Jacobson with CSPI.
Coca-Cola has confirmed that it has modified its use and plans to expand the change globally.
The Food and Drug Administration said a person would have to drink 1,000 cans of Coke per day to generate an increased risk for cancer.