Just how safe is a can of Coke?

[Not strictly complementary I know, but important given the amount consumed]

The world is addicted to Coca-Cola. Each day, 1.6 billion cans and bottles of the sickly brown liquid are gulped down, making it the globe’s most recognised brand.
But ever since it was first concocted as a brain tonic in 1886 (designed to treat ‘sick headaches, neuralgia, hysteria and melancholy’), the makers of Coca-Cola have been secretive about what goes into their drink.
American pharmacist and Coke founder Asa Chandler was so concerned that the recipe could fall into the wrong hands he reportedly never wrote it down.
That secrecy lives on today. Coca-Cola insists only two people alive know the formula, that they never travel on the same plane in case it crashes and that the list of ingredients is locked in a bank vault.
But while the recipe for Coke is surrounded by the kind of mystique that marketing men dream of, the company found its formula under less welcome scrutiny this week.
For it has emerged that Coca-Cola in the U.S. has reduced levels of one of its ingredients following fears that it could cause cancer.
The chemical — 4-methylimidazole (4-MI) — helps to give the drink its colour, but is listed by Californian health officials as a potential carcinogen. 

Source  - Daily Mail