Basically if you smoke moderately every weekend you will most likely be positive. All the time. Your best bet is to substitute if you can. I've heard good things about Urine Luck,Quick Fix, and Number 1, depending on your particular situation. Dont waste your money on 2 detox drinks a week. Thats too much money to throw away on such a unsure thing. I would investigate the subbing options. Good Luck!