My advice, you have nothing to lose by taking the urine test. (Well, I guess you may lose the opportunity for good instead of turning it down and trying again in the future hehe) I've written here about my H2O method in the past. You can read it on my site, but basically what I do is drink a shitload of water about 3 hours before the test. Ensure your pee isn't the 1st or 2nd pee of the day, don't pee into the cup until you're halfway done peeing, etc.

Your pee should become diluted enough where the reading won't be positive enough to return a positive result. You can add some vitamin B to add color, etc. Don't stop drinking the water until you've peed. You want it to be clear and you want to drink enough water where you're almost uncomfortable (like 1 - 2 liters). Don't drink too much water or you'll die, although that doesn't happen very often haha.

So my advice is to stop smoking now, take the pee test but with a lot of water under your belt, get it? Under your belt? Hahahaha