How Long Does Marijuana Stay in Your System? | Weeday

Whether it's for a drug test, legal reasons, or health concerns, knowing how long marijuana lasts is essential.
Young man exhaling smoke with a beautiful golden hour sunlit sky in the background.

As marijuana shakes off its historical stigma, the plant has boldly stepped into the spotlight, gaining cultural acceptance and legal recognition. From the bustling streets of Amsterdam to the progressive states of the U.S., marijuana's presence is more noticeable than ever. And while we at Weeday have been covering the effects of marijuana in the perspective of using accessories, increasingly, people—whether they're a casual consumer, a medicinal user, or simply curious—seek to deepen their understanding of this intriguing plant.

Amongst the numerous inquiries related to marijuana, one question seems to echo louder than the rest: How long does marijuana stay in your system? How long does marijuana stay in your system? This isn't just casual curiosity—it's a question with weighty consequences. Understanding the duration marijuana stays in your system can significantly affect various aspects of people's lives, from employment opportunities hinged on mandatory drug testing, competitive sports regulations, legal issues, to personal health and well-being. Furthermore, this information is critical for individuals who wish to gain a deeper understanding of their body's interaction with marijuana. So, let's embark on this fascinating journey to uncover the secrets of how long marijuana truly stays in your system.

The Complexity of Cannabis Metabolism

The primary psychoactive ingredient in marijuana is delta-9-tetrahydrocannabinol, better known as THC. When you consume marijuana, THC rapidly enters your bloodstream and makes its way to your brain, where it causes the classic effects of intoxication. However, THC doesn't just disappear after these effects wear off. Your body needs to break it down and eliminate it, a process that can take a significant amount of time.

Here's where it gets tricky: THC is broken down into a compound called THC-COOH, which is fat-soluble (or lipophilic). This means it binds to fat cells and can stay in your system long after the psychoactive effects have subsided. Because of this fat-solubility, combined with individual differences in metabolism and body composition, the time that marijuana stays in the body system can vary greatly among individuals.

Factors Influencing Detection Time

Several factors can influence how long marijuana stays in your system. These include:

  • Frequency and Amount of Use: The more often you use, the longer THC will remain in your body.
  • Body Mass Index (BMI): THC binds to fat cells, meaning the higher BMI (more fat cells in your body) you have, the higher chance THC remains in your body.
  • Metabolism: People with quicker metabolic rates tend to process THC faster than those with slower ones.
  • Hydration: Adequate water intake can help expedite the elimination of THC from the body.
  • Diet: A diet rich in fat might cause THC to stay in your system longer.

Since every individual differs on the above factors, it is important to address that everyone can have varying answers depending on how long marijuana stays in the body.

THC Detection Time Frames by Testing Methods

There are four different major methods to detect THC in your body, each with distinct detection timeframes due to their differing natures. The main methods of testing are:

  • Blood Tests
  • Urine Tests
  • Saliva Tests
  • Hair Tests

With each method resulting in different timeframes, let's examine how each method differs in sensitivity and detection duration.

Blood Tests

Though invasive, blood tests are the most accurate standard for identifying recent usage by directly measuring the presence of THC and its metabolites in your bloodstream. Typically, THC is detectable in the blood for about 1-2 days after use in occasional users. However, these timelines can significantly vary depending on several factors, including frequency of use, dosage, and individual metabolism. For chronic or heavy marijuana users, THC can be detectable in the blood for much longer periods. In some cases, THC has been detected in blood tests up to 25 days after the last use. This extended timeframe is attributed to the nature of THC being fat-soluble, which can be stored in fat cells and released back into the bloodstream over time.

It's worth noting that THC presence in the blood does not equate to impairment. While the effect from marijuana typically lasts a few hours, THC can be detected long after these effects have subsided. The primary purpose of blood testing is often to determine recent use or impairment, such as in legal settings (e.g., driving under influence). But it's also used in research settings to understand more about how the body metabolizes and eliminates marijuana.

As the scientific community continues to explore the complexities of marijuana and its impact on our bodies, our understanding of how long marijuana stays in the system will surely evolve. For now, it's crucial to bear in mind that these mentioned timeframes are averages and subject to the variables discussed.

Urine Tests

Urine testing is the most common method of drug testing, especially within the workplace. These tests don't detect THC itself but rather its metabolite, THC-COOH, THC's non-psychoactive metabolite. After marijuana use, THC is processed by the liver and expelled in urine. The detection window in urine can greatly fluctuate depending on usage frequency and amount:

  • Single Use: Occasional users may have detectable levels for 3-8 days post-consumption.
  • Frequent Use: Regular users might test positive for 10-15 days, sometimes longer.
  • Chronic, Heavy Use: Those with heavy, habitual use may see a detection window from 30 to up to 45-77 days.

Employers favor urine tests for their cost-effectiveness and extended detection period. However, they have been criticized because they cannot accurately determine current impairment—only past use. This is particularly problematic for medicinal marijuana patients who could be non-impaired but still test positive at the time of testing.

Understanding these aspects can help individuals make informed decisions about their consumption, bearing in mind that individual lifestyles can lead to results that significantly differ from the average.

Saliva Tests

Also known as oral fluid testing, saliva tests are a relatively new method for detecting marijuana use. They work by identifying THC directly in saliva. Commonly utilized in scenarios requiring confirmation of recent marijuana use—like roadside sobriety checks. They have the advantage of being non-invasive and easy to administer on the spot. The detection window for marijuana in saliva varies but typically spans a short period.Here's a rough guide:

  • Recent Use: Within 24 hours of consumption, saliva tests can generally detect marijuana usage,making them a good option for identifying recent use or impairment.
  • Regular Use: Detection for habitual users may last up to 72 hours post-use, although this timeframe can vary.
  • Chronic, Heavy Use: In some cases, THC traces could stay in saliva for as long as 30 days, though shorter windows are more usual.

Saliva testing is growing in popularity because of its convenient process and quick detection capabilities. Yet, it's important to note that compared to urine or blood tests, saliva methods aren't as well-established and extensively validated by researchers. As such, its efficiency and accuracy may not be entirely reliable in all situations. Influences such as recent meals, beverages, or dental care can also affect the test results.

Understanding the basics of saliva testing can help you better navigate situations where such testing might be implemented, enabling informed decisions regarding marijuana use.

Hair Tests

Hair follicle drug testing, though less common due to higher costs and longer result times, offers an extensive detection window for substance use.

When you consume marijuana, the THC metabolites circulate in your bloodstream and get deposited in the hair follicles. As your hair grows, these metabolites get trapped in the hair shaft.

A typical hair test requires a sample of about 100-120 strands taken close to the scalp. While hair from any part of the body can be used, the consistent growth rate of head hair helps determine a more accurate timeline of substance use.

Hair tests can detect THC metabolites for up to 90 days or more, depending on hair length. This extended detection period makes them suitable for identifying long-term or chronic use. Nonetheless, as with all tests, limitations also exist:

  • Short-term detection: Hair tests typically cannot detect drug use within the past week since it takes about 5-7 days for hair with THC metabolites to reach a collectible length.
  • Rate of Growth: Hair typically grows about half an inch per month, but growth rates can differ significantly, influenced by factors like age, health, and ethnicity, affecting detection timelines.
  • Color and Thickness: Research indicates that hair color and thickness may influence how metabolites are absorbed by hair. Darker, coarser hair tends to incorporate higher drug levels than lighter or finer hair.
  • Outside factors: There's ongoing debate about whether exposure to secondhand marijuana smoke or even touching hair after handling marijuana could lead to a false positive hair test. Current research suggests that such positive results are unlikely without extremely high levels of exposure.
  • Interpretation: While hair tests can detect long-term use, they offer less insight into the exact level of use or pinpointing impairment at any specific time.


The different methods of testing have their advantages and disadvantages, depending on the specifics the testers are looking for. While no single test is flawless, the guidelines provided here offer a reliable indicator of what to expect during testing. Keep in mind that legal protections and regulations around drug testing vary greatly by location and context, making it essential to know the laws and rules in your specific situation. If you are in a hurry to get marijuana out of your system, this simple guide can assist you, but be aware that this process can't be rushed—it generally takes more than a day or two.


In a nutshell, the length of time marijuana stays in your system can vary widely depending on your metabolism, body fat, frequency of use, and the testing method employed. There is no one-size-fits-all answer. As our understanding of marijuana and its effects continue to grow, it is essential to stay informed about its potential impacts on your health and lifestyle. Whether used for recreation or medical purposes, understanding how long marijuana stays in your system is the key for managing drug testing scenarios, health considerations, and legalities. If you choose to use marijuana, be responsible, understand the implications, and know the laws in your region. It's always better to be safe and informed.

Whether you are new to the world of marijuana or an experienced user, we hope this blog helps you understand the complexities of THC metabolism. Once it is deemed safe for you to consume cannabis, why not try with our stylish, modular accessories that can advance reaching your new heights?
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