So the amount of THC that a person consumes is the significant factor. The effects of THC are cumulative. This means that a person who smokes several times over several days has consumed a higher THC dose than someone who smokes once, and so they are more likely to test positive. The strength of each dose of THC also matters.
Without sensitive laboratory equipment, a person cannot reliably determine the strength of their marijuana. Since fat stores marijuana, people with higher body fat concentrations may metabolize marijuana more slowly than a person with less body fat.
Body mass index BMI is one way to judge body fat. Typically, females have more body fat than males. This means that females may metabolize marijuana slightly more slowly.
Dehydration increases concentrations of THC in the body. While drinking lots of water is unlikely to affect a drug test significantly, severe dehydration might. Exercise will not significantly change the rate at which the body metabolizes THC. Exercising before a drug test, however, might. A small study of 14 regular marijuana users assesses the effects of 35 minutes of exercise on a stationary bike. The results conclude that THC concentrations increased by a statistically significant amount, suggesting that exercise right before a drug test may increase the likelihood of a positive test result.
The researchers believe that exercise may cause fat cells to release THC. For a drug test to be negative, the body must eliminate THC from the system, as well as metabolic chemicals that have links to THC. People with faster metabolisms typically eliminate THC more quickly than those with slower metabolisms. Ultimately, there are only two strategies that work for this, and they are decreasing the concentration of THC in the marijuana and speeding up the metabolism.
Proper hydration can prevent a drug test from showing unusually high THC concentrations. For people whose test results are on the border of positive and negative, this means that being dehydrated may increase the chances of a positive result.
There is no reliable way to speed up the metabolism. Exercise might help the body metabolize more THC, but exercising too near to a test may also cause a positive result. There is no way to accurately predict the amount of time it will take an individual to metabolize marijuana and eliminate it from their bodies.
Home tests can help people test themselves for the presence of marijuana in their system. You can be fired for failing a drug test even in states where the recreational use of marijuana has been legalized.
The only completely reliable way of passing the test is to stop smoking or ingesting marijuana or cannabis products. Although you will see many tips on how to beat a marijuana drug test, most have proven to be urban legends. Some of these questionable techniques include the following. This method entails drinking a lot of water or liquids and urinating several times before the test, then taking vitamin B to add color back to the urine.
Although this may lower the percentage of THC found in the urine by diluting it, it will not totally eliminate THC metabolites. Some people will also try to exercise before the test, but that can actually backfire, depending on the test, as it can release stored THC from fat into the blood, according to one study in the journal Drug and Alcohol Dependence.
Some companies sell various substances and herbal teas that are allegedly capable of "cleaning" the body's system of traces of marijuana. There is little evidence that any of them actually work.
The catch is that most of them have to be used over an extended period of time, during which the body will naturally eliminate THC anyway. This involves adding something to the urine to contaminate the sample. There are tales of using Visine, bleach, salt, or detergent to the urine sample, but these items are easily detected by the lab. All of them can be detected by the laboratory if a separate test is run for them. It is very difficult to physically overdose on marijuana because the lethal dose is so much higher than the effective dose.
Very few marijuana overdoses have ever been reported. If someone you know has taken too much marijuana, and that is the only thing they have taken, an overdose is highly unlikely, but that doesn't mean that marijuana is not harmful. Psychological distress is possible as is impairment of judgment, both of which can lead to hazardous behaviors that can harm yourself and someone else.
Although rare, people can experience THC toxicity when using marijuana in high doses, especially in the form of edibles. Symptoms can include:. If you or someone you love has a family history of mental illness, it is beneficial for you to consult your doctor before using marijuana. The concept of "set and setting" is also important.
Since people who have taken too much marijuana can experience sensory overload, minimizing overstimulating inputs in the environment can help them to relax. Some people are also more affected by marijuana than others. You may have a prescription for medical marijuana, or you may want to partake of weed or marijuana edibles in states where it is now legal for recreational use at the state level. There is a common perception that you cannot develop a physical dependence on marijuana, but this is not the case.
Psychological dependence is also a consideration. If you discontinue marijuana after regular or heavy use, you may experience symptoms of withdrawal. Signs of marijuana withdrawal include:. If you find that you can't handle symptoms of withdrawal without relapsing, you may be at risk for a substance use disorder. Do not be afraid to seek out professional support from a mental health professional.
There are therapists who can help you understand your reasons for using. They also can help you determine how cannabis use is impacting your life, and how to develop a plan to stop using if that ends up being the best choice for you. For more mental health resources, see our National Helpline Database.
Learn the best ways to manage stress and negativity in your life. Huestis MA. Human cannabinoid pharmacokinetics. Chem Biodivers. National Institute on Drug Abuse. Updated September Kulig K. Interpretation of workplace tests for cannabinoids. J Med Toxicol. Oral fluid testing for marijuana intoxication: enhancing objectivity for roadside DUI testing.
BMJ Intervention. Comparison of cannabinoids in hair with self-reported cannabis consumption in heavy, light and non-cannabis users. Drug and Alcohol Review. Exercise increases plasma THC concentrations in regular cannabis users. Drug a nd Alcohol Dependence. Cannabis stays in your system for around 30 days and can be detected in your bodily fluids during this period.
It can stay in your hair for even longer: hair tests can detect cannabis use for up to 90 days. But whether cannabis use shows up on a test depends on how much cannabis you used, and over what length of time.
Drug tests are more likely to pick up on heavy and frequent use. Working out how long cannabis stays in your system, and whether it will be picked up by a drug test, is not an exact science. In this article, we go through some of the factors which determine the length of time cannabis stays in your system.
We also discuss different drug tests, how accurate they are, and how likely they are to pick up cannabis use. The main drug tests include saliva tests, urine tests, hair tests, and blood tests. These tests measure tetrahydrocannabinol, or THC, as well as other cannabinoids.
According to one paper , cannabis can be detected in the blood for between 1 and 2 days. Cannabis enters the bloodstream very quickly, especially when it is smoked with edible cannabis it may take longer to do so. It is then metabolised, and the by-products of this reaction can stay in the bloodstream for a while.
One of the most common forms of drug test is the urine test. This is a popular form of test because it is relatively easy to carry out, does not need to be done in a laboratory setting, and is still quite accurate. Urine tests can detect cannabis use for up to 30 days, although this figure corresponds to the heaviest and most frequent use several times a day.
With infrequent use up to three times a week , a urine test will only detect cannabis for up to 3 days. More common use, when the user is smoking cannabis around four times a week, can be detected by a urine test 5 to 7 days after the event. Cannabis metabolites can be detected in oral fluid for up to 29 days, in chronic users. For infrequent users, saliva tests can detect cannabis 1 to 3 days after use. Oral fluid tests work by measuring cannabinoids such as THC tetrahydrocannabinol in the saliva.
These cannabinoids enter the saliva after cannabis is smoked, inhaled, or sprayed into the mouth. Hair tests are by far the most accurate form of drug test and can detect cannabis for up to 90 days after use.
Hair tests work because cannabis and other drugs leave trace amounts in the hair follicles after use. Since hair grows at a rate of half an inch per month, scientists can measure what drugs a person has taken by looking at a small segment 1 and a half inches of hair from close to the scalp. Hair tests do come with some disadvantages, however. The biggest disadvantage is false positives.
False positives in drug tests are when a test shows up as positive, despite the person being tested not having used cannabis. This can happen with hair tests because they measure oil in the hair, and this can be contaminated e. If you are tested for cannabis at work, you will likely be given an immunoassay test. By having two rounds of testing, the chances of false positives influencing the result are lower.
In general, drug testing has got more accurate over time, meaning that false positives are less of a problem than they were in the past. When you use cannabis, this chemical is absorbed into the blood. It then passes to the organs and fatty tissues before eventually being metabolised in the liver.
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