Let's take a big step back from the trees for a minute and look at the forrest...
You are pursuing an improvement in your appearance, on an elective basis...
In other words, it's not as though the operation is necessary to cure you of some disease or prolong your life... in which case the risk of having surgery while still smoking would be more acceptable.
Furthermore, all surgery will have risks, even under the very best of circumstances- and it is ALWAYS in your best interests to make any and all of those risks as low as they can possibly be.
In your case, minimizing your risks means NOT having this type of surgery until you have been off cigarettes completely for some period of time (ask your surgeon what time period they are comfortable with, knowing their preferred technique for your procedures).