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“How long does weed stay in your system” is one of the most searched cannabis questions on the internet — and for good reason. Whether you have a workplace drug test coming up, you’re curious about how your body processes THC, or you want to understand why the effects of an edible you ate yesterday still feel present this morning, the answer matters.
The short version: THC can be detected in your body anywhere from 24 hours to 90 days after your last use, depending on the type of test, how often you consume cannabis, your body composition, and your metabolism.
The longer version — with specific timelines by test type, the factors that speed up or slow down clearance, and practical advice — is below.
How Your Body Processes THC
When you smoke, vape, or eat cannabis, THC enters your bloodstream and travels to your brain (producing the high) and to your organs and fatty tissues (where it gets stored). Your liver then breaks THC down into metabolites — the most important one being THC-COOH, which is what most drug tests actually detect.
Here’s the key detail that makes cannabis different from almost every other substance: THC is fat-soluble. It binds to fat cells in your body and is released slowly over time. This is why weed stays detectable in your system far longer than alcohol, which is water-soluble and clears within hours.
The amount of THC stored in your body depends primarily on how often you consume, how potent the cannabis is, and how much body fat you carry. A single session leaves a small amount that clears relatively quickly. Regular daily use builds up THC stores in your fat tissue that can take weeks to fully clear.
How Long Does Weed Stay in Your System — By Test Type
Urine Test (Most Common)
Urine testing is the standard drug test for cannabis because THC-COOH concentrations remain detectable in urine longer than in any other commonly tested sample. Most workplace and pre-employment drug tests use urine.
Detection windows by usage frequency:
- Single use (one time): 3–4 days
- Moderate use (a few times per week): 5–7 days
- Daily use: 10–15 days
- Heavy daily use (multiple times per day for weeks/months): 21–30 days, with some documented cases exceeding 60 days
Standard urine tests use a cutoff of 50 ng/mL. More sensitive tests use 20–25 ng/mL, which extends the detection window by several days across all usage categories.
Blood Test
Blood tests detect active THC — not just metabolites — which means they have a much shorter detection window. Blood testing is uncommon for employment screening but is sometimes used in roadside impairment testing.
Detection window: 1–2 days for occasional users. THC typically clears the bloodstream within 3–4 hours after inhalation, but in chronic heavy users, low levels have been detected for up to 25 days.
Saliva Test
Saliva tests detect THC that has been absorbed through the mouth tissues. They have a short detection window and are used primarily for detecting recent use — particularly in roadside testing scenarios.
Detection window: 24–72 hours after last use. Some studies show detection up to 48 hours as the most reliable window.
Hair Test
Hair tests have the longest detection window of any drug test. As THC metabolites circulate in your blood, they can be incorporated into hair follicles as new hair grows. A standard hair test analyses 1.5 inches of hair closest to the scalp, representing roughly 90 days of growth.
Detection window: Up to 90 days. However, THC doesn’t appear in hair immediately — it takes 7–10 days after use for metabolites to show up in new hair growth. Hair tests are most effective for detecting patterns of regular use rather than single occasions.
Factors That Affect How Long Weed Stays in Your System
Two people can consume the same amount of cannabis on the same day and get different drug test results two weeks later. These are the factors that explain why.
Frequency and Amount of Use
This is the single biggest factor. Someone who smoked once at a party may clear THC in 3–4 days. Someone who smokes daily for months has THC built up in fat tissue that can take 30–60+ days to fully clear. The more you use, and the more frequently you use, the longer weed stays detectable.
Body Fat Percentage
THC is fat-soluble — it binds to fat cells. People with higher body fat percentage retain THC longer because they have more storage capacity. People with lower body fat clear THC faster because there’s less tissue for it to bind to.
Metabolism
Faster metabolism means faster THC clearance. Metabolic rate is influenced by genetics, age, activity level, and overall health. Younger, more active individuals tend to metabolize THC faster than older or more sedentary individuals.
Potency of Cannabis Consumed
Higher-THC cannabis delivers more THC per session. A joint of 15% THC flower deposits less THC than a dab of 80% THC shatter. More THC consumed means more THC stored, which means longer detection.
Method of Consumption
Smoked and vaped cannabis enters the bloodstream quickly through the lungs. The high peaks fast and THC blood levels drop relatively quickly. Edibles are processed through the digestive system and liver, producing 11-hydroxy-THC — a more potent metabolite that may persist slightly longer. Read our complete edibles guide for more on how edibles are processed differently.
Hydration
Hydration affects the concentration of metabolites in your urine. Well-hydrated individuals may produce more diluted samples, potentially lowering metabolite concentrations below the detection threshold. However, extremely diluted samples can be flagged as inconclusive and require a retest.
Exercise
Exercise burns fat, which temporarily releases stored THC back into the bloodstream. Regular exercise over weeks helps clear THC faster overall, but exercising within 24–48 hours before a test can actually raise THC levels temporarily by releasing stored metabolites.
Cannabis Detection Timeline — Quick Reference
Test Type / Single Use / Weekly Use / Daily Use / Heavy Daily Use
- Urine: 3–4 days / 5–7 days / 10–15 days / 21–30+ days
- Blood: 1–2 days / 2–3 days / up to 7 days / up to 25 days
- Saliva: 24–48 hrs / 24–72 hrs / up to 72 hrs / up to 72 hrs
- Hair: up to 90 days (appears 7–10 days after use)
These are general estimates. Individual results vary based on the factors described above.
Common Questions About THC and Drug Tests
Does secondhand smoke cause a positive drug test?
Under normal exposure conditions, no. Casual secondhand exposure doesn’t produce enough THC absorption to trigger a positive result on a standard drug test. Extreme, prolonged exposure in an unventilated space could theoretically produce trace levels, but this is unlikely in real-world scenarios.
Do edibles stay in your system longer than smoking?
Possibly by a small margin. Edibles produce 11-hydroxy-THC through liver metabolism, which may persist slightly longer than the metabolites from smoked cannabis. However, the primary factor in detection time is frequency and amount of use, not the consumption method.
Can you speed up THC clearance?
There’s no scientifically proven way to significantly accelerate THC clearance. Staying hydrated, exercising regularly (but not right before a test), eating a healthy diet, and simply allowing time are the most reliable approaches. Many commercial “detox kits” are unreliable and some can be flagged by testing labs.
Does CBD show up on a drug test?
Standard drug tests screen for THC, not CBD. Pure CBD products should not trigger a positive result. However, some CBD products contain trace amounts of THC (especially full-spectrum products), which could theoretically cause a positive if consumed in large quantities over time.
How long does one hit of weed stay in your system?
For a true single-use scenario, most urine tests will clear within 3–5 days. Blood and saliva tests clear within 24–48 hours. The detection window is shortest for genuinely one-time users because there’s minimal THC buildup in fat tissue.
What This Means for Cannabis Consumers in Ottawa
Cannabis is legal across Canada. Consuming cannabis is your right as an adult 19 or older in Ontario (21 in Quebec). However, some workplaces still require drug testing, and understanding how long weed stays in your system helps you make informed decisions about timing and consumption frequency.
If you’re in the Ottawa or Gatineau area and looking for quality cannabis from a trusted source, Uper Weed offers same-day weed delivery across Ottawa and Gatineau with hundreds of strains graded AA to AAAAA+. Whether you prefer Indica, Sativa, or Hybrid, flower or hash, concentrates or edibles — browse the full menu at uperweedca.com or call/text 613-614-9596.
Frequently Asked Questions
How long does weed stay in your system?
THC can be detected for 3 days to 30+ days in urine depending on usage frequency, 1–2 days in blood, 24–72 hours in saliva, and up to 90 days in hair. The primary factors affecting detection time are frequency of use, body fat percentage, and metabolism.
How long does weed stay in urine?
For single use, 3–4 days. For moderate use (a few times per week), 5–7 days. For daily use, 10–15 days. For heavy daily use over extended periods, 21–30+ days, with some cases exceeding 60 days.
How long does weed stay in your blood?
THC is typically detectable in blood for 1–2 days after use. Blood concentrations drop rapidly within 3–4 hours of inhalation. In chronic heavy users, trace levels may be detected for up to 25 days.
Can I pass a drug test after one week of not smoking?
If you were a single or occasional user, one week is typically sufficient to clear a standard urine test. If you were a daily or heavy user, one week is usually not enough — heavy users may need 3–4 weeks or longer.
Does drinking water help pass a drug test?
Staying hydrated may dilute metabolite concentrations in urine, but excessively diluted samples are often flagged for retesting. Water helps but is not a reliable strategy on its own.
Order Cannabis in Ottawa — Same-Day Delivery
Uper Weed delivers premium cannabis across Ottawa and Gatineau — flower, concentrates, edibles, vapes, and pre-rolls. Same-day delivery. Free on orders over $100. $5 off your first order.
Visit uperweedca.com or call/text 613-614-9596.
