I have medium length (shoulder blade) colored hair. First, here's my history. I smoked once about 70 days ago, and once about 40 days ago. One other time about 9 months back and completely clean otherwise for about a year and a half. From everything I've read hair tests only go back about 90 days, but I'm going to cut a few inches off the bottom to be safe. Two main questions 1) I wouldn't even call myself a light user, what should I do for cleaning and can I pass? 2) I bought the Nexxus cleaning shampoo and wil use it. How long do you leave it in? ALso, I've been told that vinegar will destroy my hair (literally) if I use it since my hair is colored. How important is the vinegar part? lastly, I was thinking of buying some of the online shampoo products, including the afterburner just to be sure. My plan is to use Nexxus daily (or more), the online stuff when I get it and again just before the test. Then the afterburner just before. Thanks for any help.