It doesn't have to do with the root of stuttering. It's a trick used to distract you from the stutter enough to get the sound out. It's the same thing as blinking your eyes, twitching your neck, slapping your thigh, or tapping your foot to get a word out. It sometimes works, it sometimes doesn't. But because of that, you're going to do it everytime and it will get conditioned. And you'll be doing it whether you want to or not. It's an abnormal behavior you are conditioning and like all tricks, they will fail you when you need them most.