How Long Does Cannabis Stay in the Urine and Blood?

Photo by Shelby Ireland on Unsplash

When you work, you sometimes have to undergo drug testing. But, first, you need to know how long cannabis stays in the urine and the blood. This is a complicated answer.

Cannabis stays around 1-30 days in the blood after consumption. The duration depends upon the testing method used, how frequently you use cannabis, and how much you last used it.

If the hair testing method is used, cannabis can be detected several months after you used it last. If you use it frequently, the longer it will take for the drug to leave your system. Tests will detect it even if months have passed since the last usage. If the hair testing method is used, it may be detected up to 90 days after the previous use.

About Hair Testing Method

The hair testing method isn’t widely used. The standard options include blood, urine, and saliva tests. The tests don’t just measure cannabis but the metabolites, which are produced as a by-product of cannabis. They stay in the system long after you have consumed marijuana. Therefore, you should understand the measurements of cannabis, such as how much is in a gram, if you want to have an accurate test. Here are a bit of the various testing scenarios used to detect cannabis.

Urine Test

Here we look at all the different testing scenarios you might encounter to have the best idea of how long weed stays in your system. If you use weed chronically and heavily, the urine test will detect it in your system for up to 30 days. If you use it moderately daily, it’s seen for up to 15 days. If you use it a few times per week, detection is up to 7 days.

Those that use it three days a week or less can expect it to last around three days in the system. Employers commonly use the urine test so expect them to give this type of test if they do any drug testing.

Blood Test

You can detect cannabis in the blood for up to two days. In some cases, it may be seen for up to 25 days with chronic users. It’s caught in the blood in only a few seconds because it’s distributed around the body, and then some of it is reabsorbed into the blood before the body breaks it down. So the metabolites stay in the bloodstream for a couple of days.

Weed Saliva Test

Another test is the saliva test, although this isn’t as common. The police will use this as a roadside test if they want to test you for drugs but not as much in the work environment. In a chronic user, weed is detectable for up to 29 days in those that use it occasionally, around three days.

Cannabis Hair Test

When you test using hair, the follicle can show weed up to 90 days after you have used it. Hair grows slowly, so it’s detectable for up to three months, thanks to the follicles. The hair follicles have tiny blood vessels, and trace amounts of cannabis stay in them long.


How Long Does it Take for Cannabis to Metabolize?

THC or delta-9-tetrahydrocannabinol is the psychoactive ingredient that causes the high we experience. It gets absorbed into the bloodstream. The fat in the tissues stores some of it and then reabsorbed back into the bloodstream. The liver breaks down the THC. There are over 80 metabolites, and drug tests look for these. The metabolites and the THC are eventually excreted out of the body.

There are different times for the excretion process. Your age, gender, and BMI determine this. How much weed you consume and how often you use it will also be a factor. It takes longer to metabolize if you use weed frequently. Cannabis with a higher THC content will also take longer to metabolize in the body. If you ingest the weed and don’t smoke it, this may impact the length it takes to metabolize in the body.

Can You Metabolize Weed Quickly?

You don’t have much say in how long it takes weed to metabolize in your body. It takes time for THC to break down, and it is not much you can do to speed the process up. A good diet, exercise, and hydration will help a little. There’s weed remedies and detox kits, but most of these don’t help you very much. Take these herbal remedies with water, but their effectiveness is not that great. It would be best to give weed time to exit the body once you consume it.

How Does Cannabis Impact the Body?

After you smoke cannabis, you’ll feel its impacts within 15-30 minutes. It will take 1-2 hours if you ingest it. THC is the ingredient that provides the “high” in cannabis. Other effects may include:

  • Being more talkative or laughing often
  • Being positive and relaxed
  • Altered time perception and senses
  • Less coordination and focus
  • More sleepiness
  • Hunger
  • A faster heartbeat
  • Dry mouth and eyes
  • Confusion
  • Restlessness
  • Feeling sick or faint
  • Anxiety or paranoia

It can take a couple of hours for the effects to wear off. Insomnia may last for a few days. If you use it regularly, some impacts of the drug may last longer. For some, the effects may stay weeks or months even after they quit using it for those that are heavy cannabis users.


Cannabis may stay in your system for a few days or months. If you think that you’re going to be tested, you will need to stop using cannabis or don’t consume that much before the test. Testing can be random, so your detection risks are high. If you want to work in an environment where drugs are prohibited, it’s best not to smoke cannabis or find other work.


I write about sleep apnea for Health Union and WebMD and cover other topics. Contact me about your own writing needs, and I would be happy to help you out with your business or blog.

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