I think you'll be fine man. I am a chronic smoker as well, and I had a drug test for my job and I just drank about 3 green teas a day, and water every day and nothing else for about 4 days, and before the test I drank 4 glasses of water took 4 aspirins (dilutes it i heard) 2 multivitamins, and 2 Vitamin B's (Makes your pee yellow from drinking so much water). I pee'd twice before then took a piss for the drug test and passed just fine.