I have white lesions/ deposition on gums ( both sides) ,it's a slight deposition ,the white patch is also on buccal mucosa . I have been a smoker and drinker for 8 years ,though I left it around 12 days ago completely. There is no pain but thicknened white layer is there on buccal mucosa and gums ,I observed the issue about 6 months ago but now it's causing discomfort. I also do check for lumps in mouth and the thickened layer gives me a feeling that there is a lump, Is it cancer ?,please help me.