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.
How long nicotine can be detected in your system also depends on how much of it has been converted to cotinine as cotinine has a longer half life. It takes 24 hours for cotinine in your system to be reduced by half.If you continue to smoke there will always be cotinine in your urine.icotine Half Life. Nicotine half life is about 2 hours. This means that 2 hours after you smoke a cigarette about half the nicotine has left your body and within about 2 hours after that the levels (from that last cigarette) are reduced by half again.