Replying to Substance abuse evaluation

Long story short: i got into some trouble, got an ACD and need to get a substance abuse evaluation. I was wondering if anyone has had to do one of these before. If they decide that I have a problem I am also required to do any of the counciling that they recommend. I havent smoked in about two months so if a piss test is required Ill pass no problem. Just wondering what to say during the evaluation (ie. what are they going to classify as having a problem)..Should i tell them that i smoke and drink once in awhile or not at all?... I dont need drug counciling and dont have time for it with my work/class schedule. Any help is greatly appreciated and will get +k