I have smoked pot on a reg. basis for years. Usually every night before bed. I haven't smoked in 2 and half weeks and I have to take a drug test tomorrow. I weigh under 120 pounds. It might be a urine test or blood test not sure which. What should I do?

You should pray that it may be a blood test. In blood it takes two - two and a half weeks to get out of your system. Urine is about 12 weeks, and hair is 90 days.

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Just like J-9 says, start praying, Since you've smoked on a regular basis for so long, it depends on the quality of the test and which type. THC can stay in your body anywhere from 3-90 days (the norm), after smoking--Since marijuana is stored in the fat cells, it takes about 3-4 weeks, generally, in low usuage cases. But it varies from person to person, with factors such as your general health, weight, metabolims, fluid intake...