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How Long Does Marijuana Stay In Your Blood?

33 Answers

Rebecca Hunt Profile
Rebecca Hunt answered
It all depends on how often marijuana is being used.

Marijuana itself will not 'stay' within the body's system. The chemical within marijuana called THC does. This chemical is stored inside the fatty tissue of different organs of the body. Despite this, the THC will be detectable for only a limited time. A drug test, including a urine test, looks for the by-product of the body that metabolises the THC within the body's fat. This by-product is called 9-carboxy-THC.

Detection times of marijuana

Frequent user blood drug test (this is defined as a person who will smoke several times a week):
THC: Four to eight hours after having smoked
THC by-product: At least two weeks (possibly more) after having smoked

Frequent user urine drug tests:
THC by-product: Two weeks up to one month after having smoked (three months for an extremely heavy user)

Infrequent user blood drug tests:
THC: Three to four hours after having smoked
THC by-product: Two to three days after having smoked

Infrequent user urine drug tests:
THC by-product: Up to 10 days after having smoked

Marijuana remains the most used illegal drug within the USA. It is a green or brown blend of dried and shredded flowers, seeds, stems and leaves of a hemp plant called Cannabis Sativa. Stronger marijuana is found in the form of hash oil, hashish and Sinsemilla. __The key active chemical within marijuana is called THC. THC is a mind-altering or psychoactive ingredient. When the smoke of marijuana is inhaled, the THC will rapidly pass from the person's lungs to their bloodstream and be carried to their brain and various organs throughout their body. The THC will act on certain receptors within the brain. These are called cannabinoid receptors. This will start off a series of cellular responses that leads to a 'high' that a user will experience. _
Anonymous Profile
Anonymous answered
Most of the previous posts go from somewhat wrong to terribly wrong. Here are some facts:for infrequent users, one time every couple of weeks or less, thc can only be detected in the blood for around 12-24 hours, urine is clean within a week or a little more, depending on the person of course. Because urine only passes the metabolite, if you piss clean, your blood is clean, because the metabolite passes from fat to blood, to urine. Frequent users, daily or more than daily use, can test positive for many weeks up to a few monthswww.canorml.org
Anonymous Profile
Anonymous answered
It totally depends on how much you take, how much water you drink, how much you weigh, and how much you exercise. If you just smoke a few hits, drink a lot of water, and exercise, it can be out of your system in less than a day if you don't have too much body fat.
If you smoke all day, every day, it can take up to a month to get out of your system, especially if you don't exercise.
Anonymous Profile
Anonymous answered
I am a 53 year old and I smoked about one joint a day for about two weeks, how long will it stay in my body?
Anonymous Profile
Anonymous answered
If its just a normal blood test then they wont be testing for weed, they'll be looking at how your blood cells are doing, but if their specifically testing for marijuana the amount of time it stays in your body depends a lot on your body type. THC stores in your fatty cells, so if you have a fast metabolism, workout a lot, drink tons of water you will definitely pass in a month.
Anonymous Profile
Anonymous answered
If you have smoked all day every day for the last five years  whats the longest possible time it can stay in your system
kershundala orourke Profile
According to the most recent research, the length of time that weed stays in your system isn't as long as was previously thought. You'll see estimates of anywhere from 3 to 90 days, but the reality is that for most people it's more in the 3 to 30 day range. Depending on your body weight and how often you use the drug.
Lee Good Profile
Lee Good answered

There is no perfect formula for determining exactly how long marijuana, weed, THC or pot stays in someone's system during a urine, blood, saliva or hair drug test - let's look at what different factors can alter the number of days (varies from 30 to 120 days since last smoking weed) marijuana will show up in an unexpected drug test. But I guess there won't be any problems if you smoke medical marijuana , really.

Aisha Profile
Aisha answered
It depends on how much do you drink water and juices. Normally it remains for about 40 days in your body. But the more water you intake, the lesser the days become.
Anonymous Profile
Anonymous answered
It can stay in your body up to 30 days, depending on the level of THC in your system.
Anonymous Profile
Anonymous answered
Tetra-hydro-cannabinoid is stored in the body fat, so if you are on the larger side, it may take a few more days or so! Even if you are skinny, remember that you still have quite a lot of fat around your organs like your kidney and liver. Good luck
Anonymous Profile
Anonymous answered
I weight 104 pounds I have to take a blood test how long will marihuana will stay in my blood??
Deborah Wacker Profile
Deborah Wacker answered
Usually it takes 30 days if you smoke it a lot and for a long time. THC is a potent drug and acts like tar in your blood stream.
Krystal DeLaRosa Profile
Depends on length of time & amount used. One time use stays in the system 3-10 days. Regular use is 30-45 days. Chronic use of marijuana can stay in the system up to 90 days.
Anonymous Profile
Anonymous answered
Well to be honest more than likely but I do have a brother who's about 15 not exacactly 170 but I got of his system in about 7=9 days something very quick it really depends on the person though
Anonymous Profile
Anonymous answered
Weed stays in your blood up to 4 to 6 weeks, or maybe more it's all about your body weight.
Anonymous Profile
Anonymous answered
30 to 60 days however if after the 30 days you want to drug test yourself your local cvs pharmacy or walgreens sell a kit that tests specifically for marijuana for at $20
Anonymous Profile
Anonymous answered
It stays in your system for at least a month. This is the drug that takes the longest to go away.
Anonymous Profile
Anonymous answered
If you smoke for two days in a roll how long will it take to be out of your system?
Anonymous Profile
Anonymous answered
THC stays in your blood stream for 30 days at least. THC is a potent drug and is so thick it is like sludge in your bloodstream. This is why it stays in your bloodstream so long.

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