How common is Necrosis, if you have smoked for 14 years, and I have 10 days before surgery and she said I need to stop?

Smoking can absolutely increase your risk for necrosis, wound healing problems, and infections. I don't know of any Board Certified Plastic Surgeon who does not require patients to stop smoking for at least 4 weeks prior to a tummy tuck. I find it hard to believe that your surgeon would agree to perform a tummy tuck on you 10 days from now, knowing that you are still smoking. The risks are real and well documented in the literature. You should certainly delay your surgery and perhaps you should also look for another surgeon who takes more appropriate precautions. 

Smoking brings a significant risk of cancer, stroke, heat attack, etc. From a Plastic Surgery standpoint it is a vasoconstrictor. Wound healing is all about getting oxygen and needed entities to the wound. It is well known that patients who smoke have a tremendous increase in their rate of serious complications, (infections, wounds falling apart, etc.). Nicotine is the main vasoconstrictor, so getting a patch or lozenge of nicotine won't help the vasoconstriction. Best to be off the tobacco/nicotine entirely before surgery. Please be honest with your Board Certified Plastic Surgeon. Together you can make a plan to quit and proceed with surgery. The amount of time between quitting and surgery will depend on the Plastic Surgeon and the procedure.

I always insist that any patients undergoing a tummy tuck
quit smoking for at least three months preoperatively.If you would only quit for 10 days
preoperatively, I would think that your chance of getting a necrosis is incredibly
high.I would definitely postpone your
surgery.Best of Luck.