I have been eating on porcelain plates with a glaze for years. Also, for those same years, I have experienced throat irritation with frequent coughing and choking symptoms with increased saliva flow. When I stopped eating from these plates, whch I would warm food with in a toaster oven at 300+ degrees, my symptoms stopped. I had multiple tests on my throat and esophagus with scopes, MRIs, ultrasound, etc. and nothing was found. Could I have lead or another kind of poisoning? The plates were made in Indonesia.