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.
While nicotine gets absorbed by the human body very quickly, it takes quite a while to leave it. Nicotine is usually detectable in urine for up to four days, however, for long-term, heavy users, it can take as long as 2-3 weeks to completely disappear from the urine.