@tinajackson40- Welcome to Mayo CLinic Connect.

Water helps flush a lot of things out of your bloodstream faster, including nicotine. But it takes about 4 full days for it to leave your body. I know that quitting is difficult. I quit one night after 35 years of smoking, a week ahead of open chest surgery for lung cancer. I was determined and had changed my mindset, but If you are planning on trying to fool a blood test then perhaps you should wait until you are ready to quit.

My cousin, several years ago, took out additional life insurance on his wife and found out that she was a smoker.

I wish you the best in your operation. I know that you have a large prep of having to do certain things by certain dates. And I'm certain that are finding these difficult but manageable. But trying to quit nicotine and reduce a lot of weight will be very trying. Please, please make sure that you are ready and determined for both.

Merry