If you’ve recently ( from a few hours to 90 days, depending on how much marijuana or how often the person has been using) vaped with marijuana that contains THC, then a urine drug test will almost certainly come back positive for THC. Vaping may alter the way in which your body takes up marijuana and cannabinoid compounds, but it doesn’t prevent THC from getting into your bloodstream – after all, it’s the THC that causes cannabis’ predominant effects.
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