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.
Marijuana can stay in the urine for up to two months in cases of very frequent, prolonged use. Basically, the more you use marijuana, the longer it will remain in your urine. If you have just tried marijuana, for example, and that was your only use, it will probably be out of your urine within a week.