I have suffered very badly for years with nasal polyps. Not only are they uncomfortable to live with and sometimes give me severe headaches, they have also caused me to completely lose my sense of smell. I have had several operations to remove them, only for them to return within a matter of a year or so. I bought a Sims salt pipe out of sheer desperation, hoping for some relief. I have used the pipe for seven months now and unbelievably my sense of smell is slowly returning, which I hope mean the polyps could be shrinking. As for the headaches, gone! What a fantastic life changing little appliance.