What % are you mixing it at? I don't have the toffee but I bought the snickers version.
Some of their mixes are good at 3%-7%. Nothing higher in a single mix.
In addition, you have to realize ECigexpress discontinued this vendor brand. It was probably old stock. If you want the good stuff you'll have to check out bull city vapor. I can tell the difference with factory sealed flavorings and older stock. May not be your problem.
However, once I bought the usa flavor from both vendors. No flavor in the ecx version. Nice full flavor in the bull city factory sealed version. (No offense to ecx since I do use them at times).