What Causes Blisters On The Tongue After Chewing Tobacco?

hello sir i have chewing gutkhas from past 13 yrs and i am still continuing but i changed from gutkha to rajnigandha /tlsi from around a year or so i can feel my tonsils to be harder and i feel a sensation in my neck sometimes in back of my ear a sense of little pain my age is around 30 yrs and weight is 55 i eat veg and is a little choosy in foods basiclly i eat rice dal and potatoes mostly .i consume around 4 pckts a day and find it hard to quit .some months back around 9 mnths i went to ent spclt he gave me some antioxidants after inspection inside mouth he said its ok dnt chew .what is the pain in the tonsils and i check if there is any lump or something but thr is nothing only the tonsils getting hard and some tonsils in back of my jaw too under the ear .please advice me doctor what is it and what to do .and i have leison in side of my tongue something like its been cut and little blisters in my tongue.what r those.