Cannabis Tourist Advice

THC – How long does it stay in your system


THC – how long does i  stay in your system? Unfortunately, there is not a definitive answer to this question.

The following article was reposted from Greencamp and written by 

As it turns out, it all depends on several factors:

  • Basal Metabolic Rate (BMR)
  • Body Mass Index (BMI)
  • Frequency of use
  • Potency of the strain
  • Method of consumption

It’s also important to point out that only THC is detectable in tests. Other non-psychoactive marijuana compounds such as cannabidiol (CBD) can’t be distinguished since the tests are designed to detect only THC.

Marijuana does not stay the same amount of time in blood, urine and saliva.

As you can see from the table above, THC stays longer in urine than in blood. Additionally, it can be also found in your hair, sweat, and saliva.

Currently, the most common and accurate way of testing is by taking a sample of urine to detect  carboxy-tetrahydrocannabinol (THC-COOH), a metabolite of THC which stays in our system the longest.

But, as I have already said, there is no one-size-fits-all answer on the presence of THC in your system.

What we do have, however, are some well known facts, for each of the testing methods.

THC stays in blood from 1 to 7 days, depending on the frequency of use

Since it does not stay long in blood, that way of testing is not that popular anymore.

It has been recently used as a roadside drug test for preventing high driving or to determine if the person has used marijuana recently.

However, after smoking, tetrahydrocannabinol just runs through the blood to find the fat cells. And that is where it stays longer.

So, in general, if you’re not a regular smoker and you just took a few puffs or it was a one-time deal, it will stay in your blood for about 24 hours up to two days.

On the other hand, if you use cannabis more frequently, but not every day, it takes about 3 days for it to get cleansed from your blood.

Yet, if you are a regular, every day user you’ll need around 7 days to get rid of THC from the blood.

THC stays in urine from 7-70 days, depending on the frequency of use

When it comes to urine testing, it’s a whole different story.

With urine testing, it’s not the THC that is looked for, but rather a non psychoactive metabolic intermediate carboxy-tetrahydrocannabinol (THC-COOH).

After using marijuana, our liver metabolizes it into THC-COOH, which is then stored in urine.

Again, how long THC stays in urine depends on how much and how often you toked.

If you have used marijuana once it will probably stay in your urine for about 7 days.

If you smoked marijuana 2 to 4 times in a week but didn’t use it afterward, it will stay for 10 to 18 days.

If you’re a more frequent user (if you smoke 5 or 6 times a week) you can expect the metabolite to remain in your urine from 30 to 48 days.

Medical marijuana users and daily users need a bit more time to get rid of the compound.

If you use marijuana on daily basis, and several times during the day, you’ll need about 50 to even 70 days to fully cleanse your system of marijuana.

THC stays in hair for up to 90 days

Hair testing is not that common these days but it can detect THC for the longest time.

The hair test can detect a presence of drugs in your system for about 90 days after ingesting it.

THC and its metabolites are detectable in hair just a week after the consumption, since it takes that long for drug-containing hair to grow.

In fact, it can be detected from a single hair sample taken 1.5 inches from the scalp.

These kinds of test are very precise and can detect very small amounts of THC-COOH in a hair sample. In fact it can detect even 1 picogram per milligram of the substance, which is very, very little.

On a side note: if the first hair sample tests positive, you will be asked to provide a second sample to confirm the results.

THC stays in saliva for 1-7 days

Saliva marijuana tests are also not really common today and are mostly used by police officers during roadside drug testing for preventing impaired drivers taking the wheel stoned.

THC and its metabolites are detectable by saliva tests just an hour after consuming.

If you have used marijuana once you’ll test positive for the next 24 hours.

On the other hand, if you are an occasional but frequent user it will stay for the next 72 hours after consumption.

If you are a regular heavy consumer or a daily medical user, saliva test will show positive results for up to a week.

Roadside saliva tests have been very controversial recently. The thing is you can test positive on THC without even being stoned at the moment. It’s still very difficult to determine if the driver is really impaired or not.

THC stays in sweat for 7-28 days

Yes, marijuana can be detected even through sweat. This is also not a common way of testing people for cannabis and is usually used for monitoring patients during drug rehab treatments and employment programs.

Anyway, THC metabolites can be detected for about one to four weeks in your sweat.

Still, this also depends on the individual itself, how much does he or she sweat, how much do they work out and environmental factors such as temperature and air humidity.

THC sweat patches are applied directly to the skin and are usually worn from 7 to 14 days. After that period patches are taken off for testing.

Since the amount of sweating varies from person to person, the accuracy of patch testing is limited. And it’s hard to control if someone had worn it all the time, of course.

Sweat patches can detect THC just a few hours before its removal but what a patch can detect depend on how much THC was consumed.

How long do edibles stay in your system for drug test?

Consumption method is very important when it comes to detecting THC in your blood and urine.

When you take a cannabis brownie or eat a marijuana candy, it takes a little bit longer to feel the “high”, when compared to smoking.

When marijuana first reaches your stomach, it takes some time for the digestion process to start. Afterwards, cannabis is processed by the liver and only then the cannabinoids enter our blood.

That’s why marijuana edibles stay in blood for longer, from about a week to a month.

In fact, in the first 5 days after taking an edible, 80 to 90% of THC will get removed from your bloodstream and urine.

The rest of the THC will stay in your system, but for how long, depends on the factors we talked about earlier.

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