You may find that your snoring is not confined to a single cause but is multifactoral. For example, you may be snoring because you are sleeping with your mouth open. But the reason you habitually breathe with your mouth open may be because you have an allergy that is causing nasal stuffiness and preventing you from breathing through your nose. In this situation you will need to address both the nasal stuffiness and the mouth breathing in order to control your snoring.