DW,
Many times it is possible to diagnosis a condition in the mouth without a biposy. I'll repeat what Gary has told you twice already, get an appointment and have it checked and you will probably be feeling a whole lot better.
And, congratulations on kicking your habit. Just in case you ever consider starting again just check out the following web site which was put up by one of the members here:
www.outdoortexan.com . If you know anyone else that dips, refer them to the site.
Jerry