I've thought about bleaching and redying twice but i've talked to a few friends telling me that since i have black hair, dying it back from bleach to black will make it orange with the possibility of severely damaging it or even falling out.. i was wondering since i cut my hair so much by the time i take my test it'll all be new hair that has grown during my time not smoking. Does this mean this is all new hair that has grown without the metabolites/impurities? let me know what you think.. Thanks for all your help