Spots in mouth. Attaching photos.

I have these white spots under my cheek (near the upper 3rd molar region on both sides) initially which i got checked with multiple dentists . They told me its fordyce spots . But now they have spread to like in whole mouth and they are like liquid filled bumps in lower part of mouth and on upper part they are group of white spots . Also i believe my skin has got thickened in mouth and under my lips. Dentist and dermatologist still say nothing to worry , its only fordyce spots . I have these 2 upper wisdom teeth which are in constant contact with my soft tissues of mouth and dentist says its because of that . These spots doesnt hurt , sometimes burn , sometimes cause sensation in my mouth . Also my upper lips have become dark coloured .I have smoked cigg for about 2 years . Also one thing that the situation is same on both sides of mouth . Is it possible for cancer to occur on both sides with same growth .Attaching photos.