i few people i know who cant stop smoking have used this on multiple occasions, and said it was worked. same people dropped a good amount of money on those system cleansers and toxin blockers and they didnt work.
there is this stuff called AZO, its used to treat urinaty tract infections. u can get it at walmart for a few dollars. they used it in some sort of regiment in the days leading up to the test. not sure of the system they used, but i'll see if i can find out. this may have helped a little bit. but be careful of what your friend uses cause alot of places while testing for drugs, also test for the chemicals in alot of the system cleaners, so unless he's using something all natural, i would advise against it. also, this site (
www.erowid.org) has alot of resources on the subject. this link specificaly.....
http://www.erowid.org/psychoactives/.../testing.shtml
hope this helps