Most detoxes do not work, they pretty much have you drinking so much water that you dillute yourself. Nothing can truly detoxify or clense your body out in a short period of time. You can have the same effect from a detox and a much more reliable result if you follow the dillution method. Your best bet is qf 4.0. The only sure way to pass if you are a regular smoker is to sub. Dillution does work but I would trust the dillution method before I paid 50 bucks for a detox.