You stop using (and stay stopped) by applying what you learn at 12 step meetings to life outside of the meetings. This goes for all 12 step meetings, not just AA. We need to apply these principles in all our affairs. These are good, solid principles that are consistent with anyone's philosophy. Furthermore, we need to not just work the steps; we need to live the steps. Example: we learn at 12 step meetings that we can't control other people and that we need to let go of resentments. So when someone annoys you, we don't let resentment build. Letting go of resentments improves one's attitude regardless of one's philosophical or religious beliefs.
If you are feeling a trigger to use or if you are just feeling a bad feeling, practice the principles you learn at meetings in "all your affairs."