Sorry to go on and on, one other thing to factor in, is body fat and metabolism, the less body fat you have the less metabolites you store so you pass them through you sytem faster the same is true of metabolism, if you have a high metabolism you will also rid your sytem of metabolites much faster, what I personally have been curious about is if age has any factor, as i HAVEN'T FOUND ANY INFO REGARDING AGE OR SEX ONE WAY OR THE OTHER, AND i HAVE LOOKED, (I'm half a year shy of 40). Truth is my kids are probably older than you, actually I'm sure two of them are. Now in my case I eat usually 1 meal a day sometimes two, but I rarly eat more than twice a day and almost never before 5p.m. so my metabolism is slow as hell, which means I could potentially store metabolites up to two months without smoking, really everybodys body chemistry is different but you best bet is stop now keep diluting, take Creatin till the test, and actually it helps to rapidly build muscle, if you care about that, either though chemical enhancement or by eating red meat or fish, as both are excellent sources - and you will easily pass and get get on with life.