Oh, forgot to mention. Colas are very addictive and slightly different than caffene. It'll take about a year of no colas, before colas will no longer taste good. I don't know though if you really have caffine or a nutrasweet problem. I thought 1 year ago they took the caffine out of Dews. I know they did out of the normal dew, I don't know about the diet dew.