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.
The main metabolites produced are nicotine N-oxide and cotinine (major indicator of nicotine presence). Generally, it takes about 72 hours from the last use for other nicotine by-products to leave the system. Yet cotinine remains in the system for as long as four days.