Pre-Op SMOKING?

I went to the library and looked this up but did not find the answer: My Dr. requires you stop smoking 2 weeks prior to WLS.QUESTION: How can 2 weeks make that big of a change in the way your scar or insides heal also he didn't say anything about starting again after surgery, I already know that smoking is bad and everyone needs to stop for the rewards that come with doing but what i'am interested in is the medical facts about this and how it relates to this surgery.

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