It's probably not in your blood anymore, just your hair an urine. First, stop smoking. Second, do a lot of cardio to sweat some of that thc out of your system (some say it works, some say it doesn't). Third, it has been said cranberry juice and water can help flush the thc out of your system. It also depends on your body fat and metabolism because thc latches on to fat.
If none of that shit works, you better ask someone who's drug free for some piss and keep it at room temperature on the dining room table.
If none of that shit works, you better ask someone who's drug free for some piss and keep it at room temperature on the dining room table.