According to many people on this forum, Detoxer's do not work. Its the water that you have to drink with them that dilutes your urine. I just completed Drug and Alcohol counseling and if your urine is diluted, they look down on that. Its as if your trying to hide something. Which you are. My best advice to you is hold out and don't smoke! There are dilution methods in which you can bring up your creatine levels and color your urine, but the best bet is to NOT SMOKE. Are you referred there through the courts, probation? You don't want to have to face that because you couldnt hold out for awhile.
If it's that important to you try diluting or substitution, but abstinence would be your best bet. Those places don't play around.