I haven't smoked cannabis in 5 months. if i smoke once how long until i can pass urine screen?

Below: Studies suggest someone who smokes often can expect to test positive for around a week following last use. According to the NDCI, after 10 days, most frequent users should pass a urine test at the 50 ng/mL threshold. “Based upon recent scientific evidence, at the 50 ng/mL cutoff concentration for the detection of cannabinoids in urine, it would be unlikely for a chronic user to produce a positive urine drug test result for longer than 10 days after the last smoking episode.” However, there’s no guarantee that a heavy cannabis smoker will be free of THC metabolites after 10 days. Studies show it’s possible for some users to test positive for up to a month after last use. In one extreme case, a person who reported using cannabis heavily for over 10 years managed to test positive (above 20 ng/mL limit) for up to 67 days after last use.