When you use cannabis, THC (the main chemical that makes you feel high) stays in your body for a while, even after the effects wear off. Whether you’re taking a drug test or just curious, it’s important to know how long weed stays in your system.
In this guide, we’ll walk you through what affects how long THC stays in your body, where it shows up, and how long it can be detected.
What Is THC?
THC stands for delta-9-tetrahydrocannabinol. It’s the main psychoactive part of cannabis. That means it’s the chemical that makes you feel high.
Once you smoke, vape, or eat weed, THC travels through your blood and reaches your brain. That’s when you start to feel the effects. But even after the high goes away, THC sticks around in your body.
THC is stored in fat cells, so it leaves the body slowly over time. This is why it can show up on a test days or even weeks after you’ve used it.
How Your Body Processes THC
Your body breaks down THC in your liver. It turns THC into chemicals called metabolites. These stay in your body and are what drug tests look for.
The main metabolite is called THC-COOH. It doesn’t make you high, but it stays in your system longer than THC itself.
What Affects How Long Weed Stays in Your System?
Many things change how long THC stays in your body. These include:
- How often you use it: The more you use, the longer it stays.
- How much you use: Bigger doses take longer to leave your body.
- Your body fat: THC sticks to fat, so more fat means longer detection times.
- Your metabolism: A faster metabolism gets rid of THC more quickly.
- How you used it: Edibles stay longer in your body than smoking or vaping.
Everyone is different, so it’s hard to say exactly how long THC will stay in your system.
How Long Does THC Stay in Urine?
Urine tests are the most common type of drug test. They don’t look for THC itself. Instead, they check for the THC-COOH metabolite.
Here’s a general idea of how long THC stays in urine:
- One-time use: 3 to 7 days
- Occasional use (2-4 times a month): 5 to 10 days
- Regular use (2-4 times a week): 10 to 21 days
- Daily use: 21 to 30+ days
Some people, especially heavy users, may test positive even after a month or more.
Source: Mayo Clinic Laboratories
THC Half-Life: What Does It Mean?
The half-life of a substance is how long it takes for half of it to leave your body.
THC has a short half-life in the blood (about 1 to 2 days). But its metabolites, like THC-COOH, have longer half-lives — around 5 to 13 days. This means they hang around longer, especially in fat cells.
The longer the half-life, the longer it takes to fully clear from your system.
Source: National Library of Medicine
Where Else Can THC Be Detected?
Besides urine, THC and its byproducts can be found in other parts of your body.
Blood
- Detection window: Up to 2 days for occasional users
- Chronic users: THC can be found for up to 7 days or more
Blood tests are less common and often used in accidents or legal cases.
Saliva
- Detection window: 24 to 72 hours for most users
Saliva tests are sometimes used for roadside checks. They detect recent use.
Hair
- Detection window: Up to 90 days
Hair tests can show use going back several months. But they don’t show recent use very well.
One-Time Use vs. Regular Use
If you only used cannabis once, your body might get rid of THC faster. Occasional users often test clean after a few days.
But regular or daily users can store THC in fat cells. Each time you use, it adds more THC to your body. This can make it take much longer to fully clear out.
Understanding Indica, Sativa, and Hybrid
Cannabis strains fall into three main types: indica, sativa, and hybrid. Each type affects your body differently.
- Indica marijuana strains: Known for relaxing effects. Often used at night or for stress relief.
- Sativa cannabis strains: Uplifting and energizing. Some use it to boost creativity or focus.
- Hybrid weed strains: A mix of both. Can offer balanced effects depending on the strain.
No matter the type, they all contain THC and can be detected in your system.
Our Cannabis Grades: Budget Buds to Craft
At Get Kush, we offer a wide range of cannabis options to fit every need and budget.
- Budget Marijuana Buds: Affordable and reliable. Great for everyday use.
- Trips Weed Flower (AAA): Stronger, more flavorful, and a step up from basic options.
- Quads Weed Flower (AAAA): Premium quality with powerful effects and great taste.
- Craft Weed Flower: Small-batch, top-tier buds with careful growing and curing for the best experience.
Whatever level you choose, all of our products are tested for quality and freshness.
How to Help Your Body Clear THC
There’s no magic way to get rid of THC overnight, but some things may help over time:
- Drink water: Stay hydrated to help your body flush out toxins.
- Eat healthy: A good diet supports your liver and metabolism.
- Exercise: It can help burn fat, where THC is stored.
- Sleep well: Your body does a lot of cleanup work while you sleep.
Keep in mind that detox drinks and pills rarely work as advertised. Most drug tests are designed to catch those tricks.
Common Myths About THC in Your System
Let’s clear up some common misunderstandings:
- “I’ll be clean in a few days.” Maybe — but only if you used once or very rarely.
- “Drinking lots of water will flush it out.” Water helps, but it won’t erase THC instantly.
- “I can fool the test with a detox kit.” Most tests can catch diluted or tampered samples.
- “I’m skinny, so I’ll be clean fast.” While fat does store THC, other factors also play a role.
When Should You Be Concerned?
If you know you’ll be drug tested, you should plan ahead. Stop using cannabis as early as possible. Even one use can show up in tests for days.
For heavy users, it may take 30 to 60 days to fully test clean.
If you’re using cannabis for medical reasons, talk to your healthcare provider. They may be able to support you through the process.
Final Thoughts
How long weed stays in your system depends on many factors. It could be a few days or over a month. Urine tests are the most common and can detect THC for the longest period.
Knowing this can help you make informed decisions — whether for a job, a test, or just peace of mind.
If you’re looking for cannabis products in Canada, Get Kush is a trusted source for top-quality weed options. Whether you’re new to cannabis or a regular user, always be mindful of your usage and how it may affect your system.
REFERENCES:
Ng, T., Gupta, V. (2021, November 20). Tetrahydrocannabinol (THC). National Library of Medicine, National Center for Biotechnology Information. Available at: https://www.ncbi.nlm.nih.gov/books/NBK563174/
Carly V. Medically reviewed by Eloise T., RN, MSN, AGPCNP-BC. (2024, April 23). How Long Does Weed Stay in Your System?. Available at: https://www.healthline.com/health/how-long-does-weed-stay-in-your-system