Hello, Thanks for consulting HCM Read your query as you have white patch in jaw and palate this can be your smoking habit induced white lesion it can be oral leukoplakia , smokers palate , bacterial infection candidiasis , or oral submucous fibrosis . Dont worry I will advise you to quit your smoking habit first it is injurious to your health. Maintain proper oral hygiene , use mouthwash chlorhexidine regularly , you can take capsule vitamin A Supplements with Antioxitant by consulting with your local doctor . I will also suggest you to consult oral surgeon for visual examination of white patch and to rule out the diagnosis, if needed go for investigations like biopsy to confirm the diagnosis . Hope this will help you.