One way to get used to not smoking is to practice deep breathing. This practice requires that you first notice your breath. While sitting in a quiet place, sit tall and breathe in deeply, allowing your belly to expand as your lungs fill with air. Pay attention to your diaphragm as it moves up and down with your breathing. Notice how you must push the air from your lungs as you exhale. Continue this breathing slowly and deeply. Make it a part of your daily routine and practice breathing whenever you feel stressed.