How long will marijuana take to get out of my system? i have smoked it twice in the past 3 weeks i weigh 125 pounds if that means anything..

THC: Single use of marijuana should be out of your urine in 1 to 7 days. Regular use of marijuana – should be out of urine in 7 to 100 days. Single use marijuana can be detected 12 to 24 hours in blood. Regular use marijuana can be detected for 2 to 7 days in blood. Marijuana regular use detected in hair for months. Single use might not be picked up in hair.