help! short notice drug test

I need some advice and would appreciate it if anyone could help. I am regular smoker, smoke pretty much everyday for the last 4 years with a couple stretches of being clean mixed up in between. I just found out that im going to be drug tested for a job sometime next week, im getting a packet in the mail on monday and im going to have to call a number in the packet to schedule my drug test. The last time i smoked was wednesday night (feb 2) and i've been drinking lots of water and cranberry juice since thursday. Is there anything else i should do to clean my system so i can pass this drug test. Someone told me to go get some stuff at GNC, some pills, and that should help me detox my system. Any ideas or suggestions on how to help detox my body would be greatly appreciated. Thanks.

flushing your system not wont help but what u can do is not smoke the best way to beat the test is to be clean when the test comes around

i plan on no longer continuing to smoke. it was more of a college thing and now that im trying to get a job i dont think it would be wise to continue my old habits. I actually got rid of everything related to smoking as soon as i heard about the job opportunity. I just dont want to screw this opportunity up because of bad decisions i made.