You’ll need to quit smoking
If you’re a smoker, your surgeon will require you to quit smoking, for a whole set of reasons related to how it compromises your cardiovascular and respiratory systems.
There’s a very good mind-training CD for this.
By the way, this is equally true for smoking cannabis, if that’s something you do. Medical cannabis has been shown to have some benefits but you cancel them out if you combust them, even if water pipes are involved. I have not seen any data on vaporization but there are tinctures, edibles and sublinguals.