This could be a result of having allergy problems, but vaping definitely aids my breathing through my nose. I think the tobacco smoke irritates my nasal membrane and keeps it swollen. I noticed an improvement almost immediately in that capacity after switching to vapor and ceasing smoking. The nasal passages seem much clearer and open. The reduction in swelling inside the nose is an obvious benefit if you are prone to this problem of sinus/allergy problems. That makes sleeping better as a result.