Habits are hard to break. Addiction is even harder. The trick is to convince your subconscious that you really, really want to stop.
Take the time to sit down and write up everything negative about the habit you want to break. As you read over your list, really visualize and feel the disgust that your habit might cause you or others.
If you need help and support creating the life you want, we offer it here: https://www.focusplanachieve.com/workshops/create-your-personal-life-plan/