grammaticality - Should "anymore" be used only in a negative statement or question?

I don't know why this is so, but I've always believed that the word anymore should only be used in a question or negative statement.

Do you go there anymore?
Don't do that anymore.

But I often hear people use it in a declarative sentence, such as

Anymore, I eat pizza with pepperoni.

To me this is just wrong. Am I wrong?