Eddie Machek, who is earning a master's degree in civil engineering from the University of Akron and who will start a doctoral program in engineering at Georgia Tech this fall, explains the difference between the degrees this way: At a bachelor's level you are going to go out and do what's been done.
A regular urine sample is enough to show the presence of nicotine in urine. Even in case of passive smokers, nicotine in the urine can be detected for 20-25 days at the maximum. Nicotine is only harmful for human in higher dose such as 30 to 60 milligram. However, it is not harmful when it is present in less quantity.
As a rough guide: if you smoke the occasional joint, weed will stay in your system for up to 10 days. If you smoke regularly, up to 45 days and if you smoke constantly, 90 days. As for being detectable in a drug test, well this depends on the type of drug test. A Urine test will detect up to a month prior, but a blood test will show positive if you've smoked any weed in the last 6 months.