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.
It can detect much lower levels of nicotine use than the urine test and can give an approximate nicotine consumption level. Cotinine might be detected thru a saliva test for up to 2-4 days after usage. â How long does nicotine stay in your system (hair tests). This is a reliable method to measure long-term nicotine use, but is an expensive method of testing. This method is extremely accurate for a period of up to 3 months after stop smoking, and can detect nicotine use for up to 1 year after quitting. â How long does nicotine stay in your system (system clean). Most people believe that nicotine is out of your system in just 3 days, but that is not correct.