drink a ton of water, i dunno bout those kits but ive heard of using them, and ive heard of drinkin cranberry juice, dependin how much u smoke n exactly how long you have until changes it all a little, if you smoke numerous times a day and have it in say a week or 2, then drink a lot, exercise, and walk into the doctors office eating poppy seeds, ive heard they will make u test positive and if the doctor sees you eating them then hel get you to go at a later time so you can clean out ur system more