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.
THC has over 80 metabolites. Even after the THC has left your bloodstream, these metabolites remain. Drug tests try to pick up these metabolites, either in the hair, blood, urine, or saliva.
As well as the extent and frequency of cannabis use, there are several other factors that can affect how long cannabis and THC remain in your body.
A person with more fat relative to their height, age, sex etc. By contrast, someone who has a lower BMI Body Mass Index and exercises regularly may find that marijuana does not remain in their system for as long. The potency of cannabis can also play a part. Stronger cannabis is likely to remain in your system for a longer period of time since it will contain a greater quantity of THC. Health Conditions Discover Plan Connect. Medically reviewed by Zara Risoldi Cochrane, Pharm.
Detection time by drug test Metabolization time Factors affecting metabolization How to metabolize faster When effects start When effects stop Takeaway It varies according to dose Weed, also known as marijuana or cannabis, is usually detectable in bodily fluids for 1 to 30 days after last use.
Read on to find out the detection windows for cannabis in urine, blood, saliva, hair, and more. How long is it detectable via drug testing? How long does it take to break down metabolize? What factors affect how long it stays in your system? Is there anything you can do to metabolize it faster? How long does it take to feel the effects? How long does it take for the effects to wear off? The bottom line. Read this next. What to Expect from Marijuana Withdrawal.
Medically reviewed by Timothy J. Legg, Ph. How Long Does Acid Last? What to Expect. Medically reviewed by Alan Carter, Pharm.
More Teens Are Vaping Cannabis. Urine testing is the most common drug testing method. THC byproducts can be detected in urine for the following amounts of time :. THC content in blood quickly peaks within the first few minutes of smoking weed and then declines within an hour. But if you consume your weed in edible form, you can expect your blood THC content to peak around 3 hours after consumption. However, studies show some frequent marijuana users' blood will test positive even after seven days of abstinence.
Saliva testing is common in workplaces and uses a swab placed between the lower cheek and gum. Saliva tests can detect marijuana for up to 24 hours after last consumption in infrequent cannabis users, and up to 30 hours in regular and chronic users. Hair follicle testing has the longest detection window, or the period weed can be detected after last use. Hair follicle tests can detect weed for up to 90 days after last consumption , for most users.
User frequency. Hair follicle test. Experts agree the only way to get weed out of your system is to stop using it. And, if you're a chronic smoker, you're likely in for a waiting game. 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. Center for Disease Control. Marijuana and Public Health. Updated March 7, Oral fluid testing for marijuana intoxication: Enhancing objectivity for roadside DUI testing.
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