Hi Bret,
My husband, too, has tonsil cancer and recently finished treatment. He was a light smoker, social drinker, beer only, and had mono when he was 20 years old. He also worked in a factory with chemical exposure, and worked in orchards as a child with much exposure to fertilizers and pesticides. So take your pick! In retrospect, it would probably be more surprising if he HADN'T got cancer!