When someone over uses emoticons at the end of every sentence so much it becomes an addiction or habit and they find it hard to stop or do not even notice they are doing it anymore.
Katie66: OMG! She has such an emoticon addiction! I was talking to her about cancer and she still added those annoying smiley faces and xxx at the end!
Footyfanboy: I think you have a bit of an emoticon addiction
Glittergirl88: Don't be silly :) xx