Scroll down to where it says Urinal Drug Test and Blood Test for Nicotine. http://www.primehealthchannel.com/how-long-does-nicotine-stay-in-your-system.html
nicotine persists in the body for only 3-4 days only. But for those who are passive smokers the traces of nicotine can be found for as long as 15-20 days.