is often associated with ear symptoms - like fullness or pressure. There is tube connecting the two - Eustachian tube - middle ear to oro-pharynx (throat). The tonsil irritation
could be from infection (virus, bacteria, some times a fungus) or allergy
or even mechanical - from food and so on. Post nasal drip
could also cause.
Tobacco in ANY FORM is bad. Only the effects of additives like tar and so on are avoided by the the so called smokeless tobacco.
You seem to be intelligent and informed / partially motivated- you MUST try and stop the tobacco
It doesn't sound like cancer now - but one is never sure - see you doctor - any thing suspicious should be biopsied (sample for analysis)