How Long Does Marijuana Stay in Your System? Learn about the Duration of Detectability in Urine, Blood, Hair & More

Posted on October 19th, 2023 to cannabis by

Marijuana has gained significant attention for its potential therapeutic benefits and recreational use. However, it is important to understand how long the effects of marijuana can linger in the body, particularly when it comes to drug testing or other situations where the presence of cannabis may be a concern. In this article, we will delve into the duration of detectability in various biological samples such as urine, blood, hair, and more, shedding light on how long marijuana can stay in your system.

Marijuana Metabolism and Elimination

To comprehend the duration of marijuana’s presence in the body, one must first understand how it is metabolized and eliminated. When cannabis is consumed, its active compounds, such as THC (delta-9-tetrahydrocannabinol), are absorbed by the bloodstream and transported throughout the body. Eventually, these compounds are broken down by the liver and transformed into metabolites that are then excreted through bodily fluids and waste.

Detection Window in Urine

Urine is the most commonly used sample for drug testing due to its ease of collection and relatively long detection window for marijuana metabolites. The duration of detectability in urine can vary depending on factors like frequency and amount of marijuana use, metabolism rate, and hydration levels. Typically, marijuana can be detected in urine for up to 30 days in chronic users, while occasional users may test positive for a week or less.

Detecting Marijuana in Blood

While THC and its metabolites remain in the bloodstream for a shorter period compared to urine, blood tests can still detect recent marijuana use. Within hours of consumption, THC levels peak in the blood, gradually decreasing over time. Blood tests are often used to determine impairment at the time of testing rather than past use, as THC levels rapidly decrease within a few hours.

Hair Testing and Long-Term Use

Unlike urine and blood tests, hair testing can detect marijuana use over a much longer period. When THC is metabolized, some of its byproducts are deposited into hair follicles, leading to a longer detection window. Hair tests can detect marijuana use up to 90 days or even longer, making it a more suitable method for detecting long-term or chronic marijuana use.

Saliva and Sweat Testing

Saliva and sweat testing are relatively less common but offer advantages in certain scenarios. THC and its metabolites can be detected in saliva within a few hours after use and typically remain detectable for up to 24-48 hours. Sweat testing, on the other hand, is still undergoing development and is not widely used for marijuana detection at present.

Factors Affecting Detection Time

Several factors can influence the duration of marijuana’s presence in the body. These include the potency and frequency of marijuana use, individual metabolism rates, body mass index (BMI), hydration levels, and the sensitivity of the drug test itself. Understanding these factors can help one better estimate how long marijuana may stay detectable in their system.


The duration of marijuana’s presence in the human body varies depending on the biological sample being tested and individual factors. Urine tests offer the longest detection window, typically up to 30 days for chronic users, while blood tests primarily indicate recent use. Hair tests provide a broader timeline, detecting marijuana use for up to 90 days or more. It is crucial to consider these factors when undergoing drug testing or determining one’s own detectability. As always, it is important to consult with a healthcare professional for personalized advice regarding marijuana use and drug testing.

Need Help Obtaining Your MS Medical Marijuanas Card?

If you haven’t yet obtained your MS medical marijuanas card, be sure to take a look at Compassionate Care Consultant’s full guide on how to get a medical marijuanas card in Mississippi. Ready to schedule a consultation and take the next steps to become a registered patient? Reach out to schedule an appointment.

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