For a seemingly straightforward question, there are a many variables to think about when it concerns how long a joint will remain in one’s system.

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It’s important to begin by quantifying the lot of cannabis that constitutes a joint. As a unit the measurement, a joint has no definitive volume. This is why extravagant technologies like the tulip are simply as lot a joint as a pencil-thin doobie cobbled with each other from shake. In an initiative to ensure consistency, this post will run on the premise the a share is tantamount to one gram of three flower — though we’re well aware that pre-rolls often encompass only a half-gram the flower.

In addition, we need to specify this unit of measure by just how much THC is in a common gram. Again, a myriad of determinants determine this number ~ above a case-by-case basis, consisting of a provided strain’s potency and freshness. Raw three flower is frequently considered come contain 10 to 30 percent THC. Thus, 1000mg of cannabis (aka a gram) contains, on average, 100-300mg the THC. We’ll break-up the difference and also call the 200mg that THC because that this explainer.


Frequency of use is one more important variable in this equation.

Those who routinely consume three should, in general, guess THC remaining in their mechanism for a longer period of time when contrasted with a first-time user. That’s since THC is a lipid-soluble chemical, which means it binds to fat in our body quite than being expelled directly (like alcohol). Thus, determinants like raised body fat, wrong hydration, or a slow-moving metabolism may all boost the quantity of time that takes for THC to occupational its means out of ours systems.

For this article’s purposes, let’s assume someone v no THC in your system has smoked a one-gram joint. What happens next?

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Smoking three is the quickest method of consumption in terms of the time that takes because that THC to hit ours bloodstream. Through inhaling pot, THC very first enters our body via the lungs, which absorb the cannabinoid (along through any and also all various other cannabinoids had within the strain in question). Native there, it access time the bloodstream, whereby it is ultimately ceded to ours brains. That’s whereby the genuine magic happens.

Once we’ve quit feeling high, however, the THC in our systems doesn’t miraculously disappear. Instead, the half-life that THC is generally thought to be what from 20 hrs to 10 days, with the greater end the this selection applying to hefty users. In relation to the person body, “half-life” describes the time forced for half the amount of a substance presented to our systems to be got rid of naturally.

Using ours baseline that a gram of cannabis containing 200mg that THC – and our premise that the person in question does not have any kind of THC in their system prior to intake – we can obtain even an ext specific. (In reality, we wouldn’t consume every single milligram of THC native a joint because much of the is shed through exhilaration wisping turn off the doob between puffs. Yet let’s keep things straightforward and simply go v that 200mg value.)

For simplicity’s sake, if our first-time smoker consumes 200mg of THC, that method they’ll have roughly half the initial amount the THC (100mg) left in their system a day later. Proceeding this heat of logic, the smoker will have actually a quarter of the initial amount the THC (50mg) in their mechanism 48 hrs after consumption. The number is halved again at the three-day mark, and also so on.


At this point, that time to talk about how us test for THC. There are 4 main types of testing at this time employed come detect THC: blood tests, saliva tests, urine tests, and hair follicle tests. Each one is reliable for different lengths the time. Hair follicle analysis, for example, deserve to test confident for THC approximately 90 days after consumption. Blood and saliva tests, meanwhile, are both only helpful in detecting THC for up to 24 hours complying with usage. That said, part blood tests will detect THC approximately 72 hrs after consumption.

Interestingly, this tests are not actually searching for THC but for that metabolites – the metabolic byproducts that accumulate in our fat reserves, which space then exit from the fat cells end a duration of time.

The baseline for every these various trial and error methods is the threshold that THC required to produce a confident finding. Merely put, over there is a minimum amount of metabolites important for a test to record THC in our bodies. The typical cut-off is 50 ng/mL of THC, though some tests space able to detect THC in ~ a level of 20 ng/mL. If we consider the experimentation threshold of 50 ng/mL of THC as our baseline, we can develop a basic idea of how long a joint continues to be in our system.

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Considering every one of the above information, a first-time or infrequent customer smoking a joint through one gram of three in it that has 200mg of THC should fall listed below the testable threshold because that THC within 3 to eight days after last consumption. Of course, every number is best viewed as a basic benchmark. As scientific practices continue to evolve, we might reach a day as soon as a much more accurate method of identify this info is available, but for now, these figures are the ideal we’ve got.