Paranoid

Is 9 months long enough to get clean Im 274 pounds 5'9" excercise 2 days a week and I smoked for the first back in feb 7 09 just a few puffs. I really need this job and I've heard it depends on ur bmi fat index do you can see why I'm nervous cuz my weight plays a factor in that thx stays in my system longer anyone out there who is heavy and passed this test please give some news maybe it will ease my nerves.. Thanks