How Long Does Weed Stay in Your System?

03.20.2023

Although cannabis's effects are short-lived, cannabis can stay in the body for several weeks or even longer. Depending on how frequently or how much cannabis is consumed, the active ingredients and breakdown products of weed can stay in the body for anywhere between a few hours and 90 days.

For instance, depending on the test type, a single dose of cannabis can linger in your system for approximately 13 days. Cannabis will leave your system more quickly if you use it infrequently or lightly rather than frequently or heavily.

To answer the question, "How long does weed stay in your system?" we should focus on THC (delta-9-tetrahydrocannabinol), the intoxicating cannabinoid responsible for producing the euphoric and stoned effects. Additionally, other substances endure. Since THC is still illegal on a federal level in the US, cannabis drug tests frequently only look for THC and THC metabolites or by-products produced when THC is broken down in the body.

How long does weed stay in your system?

Cannabis' half-life is the amount of time it takes for half of the drug to be metabolized and removed from the body.

In a short period of time, THC is transformed into metabolite molecules.

THC is rapidly broken down and modified into molecules known as metabolites. THC breaks down into at least 80 different metabolites, each of which may have a different impact on the endocannabinoid system of the body. These substances are stored in body fat and slowly expelled from the body through urine and feces.

A substance must have five to six half-lives before it is almost completely gone. For this reason, it is typical that a single use is likely undetectable after 5 to 8 days.

How long does weed stay in your system? Saliva and blood tests

Blood tests for weed are not commonly used because it only stays briefly in the bloodstream. The only exceptions are certain roadside sobriety checkpoints and auto accidents.

Tests on the blood or saliva can reveal current intoxication. However, they do not reveal a level of impairment or intoxication, unlike tests for blood alcohol concentration.

How long does weed stay in your system? Hair tests

A hair test can possibly, but not always, detect daily or nearly daily cannabis use for up to three months later. However, the hair test cannot consistently identify or quantify infrequent cannabis use.

How long does weed stay in your system? Urine tests

THC metabolite tests on urine only detect recent marijuana use and do not detect current impairment or intoxication levels. This is because it takes time for your body to convert THC into the metabolites that are excreted in urine after use. Many workplaces use urine tests to identify recent drug use since several employers have a zero-tolerance policy for drug use.

False positive test results

When testing for marijuana at work, the sample may first go through an immunoassay procedure known as the RIA or EMIT. If positive results are returned, the sample is once more screened using a gas chromatograph-mass spectrometer (GCMS), which is far more accurate and reduces the likelihood of false positives.

Ibuprofen (marketed under the brand names Motrin, Advil, and Nuprin) is used to result in erroneous marijuana-positive tests. However, that issue has been fixed in current tests.

Roadside blood tests performed in jurisdictions where marijuana is legal have occasionally revealed false-positive results in individuals who had lawfully consumed cannabis but weren't actively intoxicated at the time the test was performed. A report from 2016 described a Belgian policy of roadside oral fluid testing and found that it reduced these kinds of false positives.

How long does weed stay in your system? Key elements

The length of time that THC will linger in your system depends on a number of variables. They include:

Dosage
The length of time it takes for the body to process THC and its related metabolites depends on how much of it is consumed. The higher the dosage, the longer it will stay in the system.
 

Frequency of use
The total amount of time and frequency of use significantly affect how long marijuana will stay in your system. The majority of cannabinoid detection research shows that THC stays in the bodies of chronic users much longer than it does in the systems of occasional or one-time users. Cannabis withdrawal symptoms are also noticeably more likely to develop with prolonged, heavy cannabis use.
 

Genetics
The amount of time that THC stays in the system is also influenced by genetics. For instance, individuals inherit various variations of the cytochrome P450 enzymes superfamily, which alters the body's THC levels and causes its excretion through the urine.
 

Fat
Another important element is how much fat is present in the body. The metabolite THC-COOH binds to fat molecules and is fat-soluble, allowing for long-term storage. The levels of perceivable THC metabolites can also be influenced by exercise in a similar manner. Dormant THC from fat could be released into the blood during fat burning and eliminated from the body through urine or feces.
 

Metabolism
THC and its metabolites are detected in the body for a shorter period of time in a body with elevated metabolic functions, which can degrade cannabinoids more quickly.

A body with better metabolic capabilities can degrade cannabinoids more quickly.

 

How long does weed stay in your system? Getting it out of the body faster

In the end, only two approaches are effective for this: lowering the THC content of the cannabis and accelerating metabolism.

Drinking enough water can stop a drug test from revealing unusually high THC levels. This means that just being dehydrated may raise the likelihood of a positive result for individuals whose test results are on the fence between positive and negative.

There is no proven method to accelerate metabolism. Exercise may increase the body's THC metabolization, but exercising too soon before a test may result in a positive outcome.

The time between the last exposure and the testing date is the most crucial factor.

A final word on "How long does weed stay in your system?"

It is impossible to predict how long a person will metabolize cannabis and get it out of their system. Self-testing for the presence of cannabis in the body can be done at home.

Cannabis should almost always be gone entirely or have a very low concentration in 30 days. Cannabis may leave the body in 10 days or less for infrequent users.
 
For more fun cannabis knowledge, check out Callie's Blog page.