How long does nicoteen last in the body?

depends on the person. most of the time if its one cig the buzz will last about an hour. if you are under 18 and your worrird about being caught tho dont worry they dont have a test for nicoteen. if you are in the united states tho weed they do have tests for however if they dont catching in the prosses of smoking it or if you dont have it on you they cant do shit even if you pee posidive the most they can do is search you your house and your car the same thing is true for smoking cigs under age in the united states idk about other contries tho