How long does weed stay in your blood

Smoking weed is not as dangerous, however, it comes under the category of unlawful drugs. It contains cancer producing cells that may result in the pharynx, lung, esophageal and oral cancer. A regular marijuana user must know how long does weed stay in the blood.

How does weed affect your system?

The effect of weed on your system must be studied very carefully before you take a step to use it. As soon as you take in weed, the active component in it flows into your blood system. The component is known as THC and it is something that gives a high feeling. It gets absorbed into your blood very rapidly and is carried down to the liver.

The liver is an organ in your body that is in charge of removing poisonous substances from your blood. More than 1450 milliliters of blood is circulating through your liver each minute. When THC reaches the liver, it breaks down into smaller substances named metabolites. When you go for a blood test, they not only test for THC, but also for metabolites.

Metabolites are not removed from the body immediately. It takes a lot of time to get removed as is it hydrophobic, which means it cannot be diluted with water. Hence, this is the reason why the evidence of weed cannot be cleared when you go for a urine test even after drinking a lot of water. The metabolites are deposited in your body in the form of fatty tissues. These fatty tissues are stored in organs including lungs, heart, kidneys, as well as the liver. It is also stored as body fat. The amount of these metabolites increase in your body with time if weed is used consistently. From these fatty tissue deposits in your body, THC COOH is released in very small amounts. Sooner or later with time, they get back to your system and ultimately flushed out in the faeces or urine.

Factors affecting weed in your blood

Factors affecting weed in your blood

It takes a lot of time to flush out these substances. There are a number of factors that influence on how long does weed stay in your blood. Some of them are as follows:

  • Dosage: it depends on the amount of weed you take in and how effective it will be in altering the amounts of metabolites in your blood. If a person takes in a little amount of weed but that with a high THC concentration, it will be equal to smoking large amounts of a low concentration.
  • Acute or Chronic Usage: this refers to the frequency of using weed or how long you have been taking it. It something that should be of great concern to you. A user who is acute is one who has been smoking weed regularly but for a short time period. A chronic user, however, is one who has been using it for years. The longer the time a person has been using weed, the more the chances of you having high levels of THC in your blood.
  • Ingestion: the levels of THC are low in your system when you get tested within a few hours after taking it. Yet it takes the body a long time to deal with the drug when it is taken in the form of edibles.

The above factors are all the same for every weed smoker. The amount of THC present in the weed, the frequency and time period you have been smoking it for, shows the number of metabolites in your body. Therefore, it also determines how much effort or time it would take to clean it up from your body.

There are many other factors that are not the same for every weed user. They require you to follow a detox program to clean up your body from these toxins. Following are those factors:

  • A rate of metabolism: the metabolic rate of each individual varies from person to person. People with a faster metabolism can process toxins like THC COOH faster than those who have a slower metabolism.
  • Body fat ratio: people who have the higher percentage of body fat have a tendency to store metabolites in form of fatty deposits than people who are slimmer.
  • Various supplements and medications: if a person takes in supplements, medications, or other drugs that are prescribed to him, it may lead to slowing up his metabolic rate. The slowing metabolic rate will eventually result in slowing the rate at which metabolites are flushed out of the body.
  • Healthy or unhealthy lifestyle: if you eat correctly, avoid stress, exercise, and get enough sleep, your body will work more efficiently. More efficient working body means a quick way of removing toxins.

Measuring THC using blood tests


Blood is tested for the levels of THC COOH when screened. The result is stated in nanograms per milliliter (ng/ml). The minimum amount that should be present in your blood is 20-50 ng/ml. While THC levels peak in the blood within nine minutes of lighting up, after a few hours they drop to about 60%. Most users will test negative after about three to 5 days, similar to the saliva test, and way faster than with hair or urine. Some people think that regular users won’t test negative because they’re used to the THC and it leaves their body faster. But this is a myth and the opposite is true.

If you can delay the test, you’ll have more time for your body to process and remove the metabolite from the body. If you don’t have much time you can look at ways to speed up your metabolism.

Obviously, you should abstain from use until your test. But you can also do more exercise, drink plenty of water and eat healthy foods. You could even visit a sauna as sweating helps to remove toxins from the body. All of this will help, but it’s not a miracle cure and it will still take a little while to clear your blood if you’re a heavy user.

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