I searched on the internet for the information you are seeking. If you have quit already you should be fine when you do your blood tests.

Excerp from ehow.com:

Although most of the nicotine you consume (about 90 percent) is quickly metabolized by your body's liver and then excreted from your kidneys, the remaining amount of nicotine remains in your bloodstream for about six to eight hours after smoking. Therefore, the amount of time nicotine stays in your body depends on how much nicotine is in your system. Based on the amount of cigarettes you smoke each day, there may be a small or large amount of nicotine present in your body.

I was a social smoker for years and finally stopped as well. Before stopping completely I used the e-cigarette without nicotine when I felt like being in a social situation where I was drinking and felt like smoking.

Here's the thing that helped me...I want the surgery and to be healthy more than I want to drink and smoke - which isn't that good for me anyway. I will not go back to smoking of any kind, not the e-cig or anything else. I'm over it. I try not to drink these days as well as it seems to stall my weight loss. I went to a conference and did have a few margaritas with my colleagues but as soon as I came home, I was glad to be back in a more controlled environment while I am accountable for my weight loss. Eventually I guess I'll have to enjoy a skinny margarita..

Can't help ya with the smoking thing, but the phys just wanted to make sure that I knew what I was doing, if I delt with depression or have an eating disorder. I told her I have delt with depression and even took pills, that still didn't seem to stop anything. I'm going in for my surgery tomorrow the 28th and I'm sooo nervous. I've been waiting for two years battles and now it's here, I'm scared. Good Luck to u