Cannabis (or marijuana/weed/pot) is a drug substance that tends to remain in the system for a long period after it has been consumed, sometimes as much as weeks or even months after consumption. This is because it is a fat-soluble substance that easily gets absorbed in the fatty tissues of the body. It then gets stored in the various organ tissues for a long time, until it is gradually excreted over a period of time via metabolism. It is thus very difficult to avoid its detection in the blood and takes a very long time to remove it from the blood. Even after it stops showing in the blood, it invariably shows up in hair samples even several months after consumption.
If you need to flush it out from the blood, immediately increase your intake of water in the effort to flush it out of your system. Another good idea would be to drink plenty of cranberry juice or any diuretic that flushes out the digestive system and cleans the blood. Another good home remedy is consumption of green tea and even blue berries are recommended.
However none of these methods is fool-proof and sometimes the only way to detox is to go in for a detoxification program.
answered by G R