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How Long Does Weed Stay In Your System?

  1. How to determine your time
  2. Key influencing factors
  3. Marijuana detection times in various drug tests
  4. How to reduce marijuana detection time in a drug test
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Online THC Calculator
calculates the level of thc in urine based on smoking over a specific period of time
There is no definite answer to this question, since no one can say exactly how long marijuana stays in your system. The length of time varies significantly from person to person.

When you smoke pot, THC metabolites get caught up in the fat cells (marijuana is fat soluble) from where they are gradually released over time. This time is hardly predictable. It varies for every case from a couple of days to one month and even longer. The main factors that influence it are the amount and potency of marijuana, frequency of smoking, age, weight, and personal metabolism of the smoker, his/her lifestyle, and fluid intake. Normally, if you use marijuana on rare occasions, your urine becomes free of THC in less than a week.

The approximate half-life of marijuana metabolites in the human body is 7 days, and THC calculator based on this index shows the average dynamics of the reduction of the THC level in the human body over time. It cannot predict how long weed stays in your body. It only shows the approximate daily THC levels of the average person.

How to determine your time


You can still determine your personal time by testing yourself. Buy a few home drug tests, stop smoking pot, and test yourself every day until you get a negative result. Doing this will show how long marijuana stays in your system, but do not forget that the length of time may also vary depending on various factors.

Key influencing factors


  • Amount and potency of marijuana. Obviously, the more you smoke, the more toxins will saturate your body, and the longer it will take to flush them out.
  • Frequency of smoking. Building on the above point, the more often you smoke marijuana, the longer it will take for your body to rid itself of toxins. The occasional smoker will be able to eliminate the THC much faster than a frequent smoker, but a strange phenomenon affects chronic smokers. You would expect that they would have the longest detection time and the smallest chance of passing a drug test, but this is not always the case. Chronic smokers with a high drug tolerance sometimes eliminate toxins more quickly than occasional smokers.
  • Personal metabolism. Fast metabolism lets the body naturally flush marijuana at an accelerated pace.
  • Age. This factor is closely linked to metabolism, which is usually slowing due to aging. Generally speaking, the younger you are, the faster your body will detoxify itself.
  • Weight. THC is stored in fat cells, so the less fat a smoker has, the less THC accumulates in his body. Also, skinny people usually have faster metabolism, which lets them get rid of toxins faster.
  • Lifestyle. Physical activity burns fat and accelerates metabolism, so weed stays in the body of active people for a relatively shorter period of time compared with someone who is inactive.
  • Fluid intake. Urination is highly important for cleansing the body of waste. Drinking fluids speeds up urination and flushes THC metabolites from the body.

Marijuana detection times in various drug tests


Different methods are used to detect marijuana in the human body. You can check urine, hair, saliva, blood, or sweat, but the length of time that THC is present in all these substances after smoking varies significantly, so every drug testing method has a different time range for detecting marijuana.
  • Urine. This test is the most common method of detection, and the aforementioned key factors strongly influence marijuana detection time in urine. For those who have smoked weed only once, the detection time is usually from 2 to 6 days. For moderate smokers, it is 1 to 2 weeks. Frequent users can test positive for more than 2 weeks, and in rare cases marijuana can stay in the system of heavy smokers for more than a month.
  • Hair. This kind of test is less common, and key factors do not have any impact on detection time. This test is the only one that cannot detect recent drug use, since hair needs time to grow. This is why you can test positive only starting from about one week after use. Traces of marijuana stay in the hair follicles for up 90 days, and hair from not only the head but also other parts of the body can be used as a sample.
  • Saliva. This test has the shortest detection time period. It is intended to detect only recent drug use and can detect marijuana for only the first few hours after smoking, with a maximum of 24 hours.
  • Blood. THC also does not stay in the blood for a long time, just up to 24 hours. Blood testing is not common because it is invasive, so a saliva test is preferable in most cases for detecting recent smoking of pot.
  • Sweat. This test is the rarest because the procedure for collecting samples is complicated, where a sweat patch is worn over the time. Marijuana can be detected in sweat for 1 to 4 weeks after use.

How to reduce marijuana detection time in a drug test


If marijuana stays in your system for a long time, removing it can be accelerated. For example, exercise and increased fluid intake are helpful, since these are among the main factors influencing the detox process, but these methods cannot be recommended for passing a urine test, since exercise releases toxins from fat into the bladder, thus temporarily increasing the level of THC metabolites in the urine, and excessive drinking makes urine look diluted, which leads to rejection of the sample.

If you need to prepare for a drug test, there are effective detox solutions available that will cleanse your system from marijuana upon short notice. For a hair test, detox shampoo must be used. For a saliva test, detox mouthwash is used, and detox drinks and pills are used for a urine test.

Fast THC Detox Kit

This best-selling detox kit will help you eliminate marijuana from your system and pass a drug test upon short notice. It includes the Herbal Clean QCarbo detox drink, QChew supplement, and a home THC test device to confirm the effectiveness of the cleansing process.

For more detailed information about how to pass a drug test and selecting the right method for your needs, please read the following articles:

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