Long-term nasal spray use (especially decongestants) causes rebound nasal congestion and dependence. Switching strategy: ① acupuncture/herbs from week 1, continue spray, ② week 3–4: reduce spray to half, ③ week 5+: spray only as needed, eventually stop, ④ week 8+: fully off spray. Prepare for temporary symptom worsening during transition. Use saline rinse and humidifiers as supplements. Most successfully wean off within 2–3 months.