An Irrational Number is a real number that cannot be written as a simple fraction.
1 The nicotine will totally be gone within 1-3 days after your last using tobacco.  In urine: The urine test normally can detect nicotine level within 3-4 days after the last time you use tobacco. However, if you often smoke or you are passive smokers, nicotine can stay for a period of 15 to 20 days in urine.
Its metabolite, cotinine, can be detected for as long as 4 to 7 days depending on the amount of nicotine consumed. For heavy smokers, it may be detected up to seven to fourteen days. You are beginning to see how challenging it is to adequately answer the question of How Long does Nicotine Stay In Your System.