I don't think there is a 'bad habit' if it works unless it's annoying like loudly clapping hands. But usually coping techniques have a relapse effect, after a while it wears off so I suggest to let your body speak automatically and naturally without technique and learn that your trigger is not real. In my experience, my stutter trigger is: "I cannot move my tongue when speaking", so instead of doing a coping mechanism, I just speak while observing this trigger to learn that this trigger is not fearful, true and my true intentions. The most important thing is, that you learn that stuttering doesn't bother you. Imagine, you learn to ice skate but you are bothered by falling, then this will only hinder the progress. Normally when stutterers try to unblock, then we focus on controlling speech muscles. I believe, it's more effective to control something else instead: try to control perceiving your trigger as less fearful, real and true intentions. Normally we focus on the stutter feeling (to predict a stutter) or focus on fight or flight response, I advocate that instead, we should focus on making the trigger 'I can't move my tongue when I'm in a block' less real