the key is in asprin, my good man. Two hours before the test, take 4, and drink 64 oz of water an hour before. Pee 3 times, and you are golden. I smoked 4 months, took three days off, and peed clean. I did alot of research on this topic, and a few practicals. Happy Peeing. This will work on a dip test, that will have a cut off of 50ng. Most do, the other kind is very expen.