Over the spring break, I smoked five times over the course of two weeks. It's been 19 days and i have to take a urine test tomorrow. Everyones been saying since I'm not a heavy smoker, my urine should be clean enough to pass one. I also weigh about 145 pounds and I have a pretty fast metabolism i think. I've also been exercising frequently. Just wondering if anyone has any insight on whether or not i should be worrying.