I have never had to do the test, but they are looking for a Nicotine metabolite called cotinine in your saliva. It has a half-life in the body of 20 hours, which means every 20 hours the amount in your body is cut by half... If you want to pass the test just skip your biweekly cigar for about 2 weeks leading up to the test and stay away from other smokers and you should be fine. This is just my opinion on a safe date, and in no way should be taken as a indisputable fact...obviously the longer you go without smoking before the better your odds are of passing. Good Luck!