How can you flush nicotine out of your system?

You can not flush it out pro actively. However nicotine is destroyed in the human body and every 2 hours the amount of nicotine in the body (from the starting point where you last smoked) halves. Thus if you cease smoking and stay away from smoky atmospheres, by the end of a week you should naturally be clear of it. Hoverer, nicotine is addictive and you will find it hard to stop smoking if you are a smoker. If you intend giving up, try joining a group to help you through the process and most importantly if you manage to stop don't EVER EVER be tempted to try another cigarette.