Great that you are quitting smoking, if you need added inspiration there is a post in the Blog section that vividly describes the pain of a man who died of oral cancer caused by smoking.

I agree with David and Suzanne, waiting a few days isn't goint to make a difference and it's going to take more then an antibiotic to handle the pain associated with cancer. But you can never be too careful though and getting it checked out is smart, the earlier you catch the cancer the better odds there is to beat it.