A cannabis high from smoking or vaping typically lasts 1 to 3 hours, with effects peaking around 30 minutes after your first inhale. Edibles last significantly longer, anywhere from 4 to 12 hours. But the method you use is only one piece of the puzzle. Dose, potency, your body composition, and how often you use cannabis all shift that timeline.
Smoked and Vaped Cannabis
When you inhale cannabis smoke or vapor, THC enters your bloodstream through the lungs almost immediately. You’ll feel effects within seconds to a few minutes, and they peak within about 30 minutes. The core high generally lasts 1 to 3 hours, though some residual effects (mild grogginess, slight mood changes) can linger for up to 6 hours and, in some cases, up to 24 hours.
Flower and vape cartridges follow a similar arc, but the experience differs slightly. Flower, which contains roughly 15 to 25% THC, tends to build gradually over 2 to 5 minutes and peaks between 30 and 60 minutes. Most people describe it as a steady, balanced sensation across mind and body.
Concentrates and Dabbing
Concentrates pack 60 to 90% THC, so the onset is faster and more intense. A dab hits within seconds and reaches peak intensity at 15 to 30 minutes. Despite the sharper, more dramatic onset, the total duration is roughly the same as flower: 1 to 3 hours. The difference is in the shape of the experience. Where flower feels like a slow build, concentrates hit all at once and taper from there.
Edibles and Drinks
Edibles follow a completely different timeline. After you swallow THC, your stomach and liver process it before it reaches your bloodstream. This takes 30 to 90 minutes, though some people don’t feel anything for up to 2 hours. The effects peak around 2 to 3 hours after eating and can last anywhere from 4 to 12 hours depending on the dose, your metabolism, and your tolerance level.
This slow onset is the main reason people accidentally overconsume edibles. You eat a gummy, feel nothing after an hour, take another, and then both doses hit simultaneously. The general rule is to wait at least 2 hours before deciding you need more.
Tinctures and Sublingual Products
Tinctures held under the tongue sit somewhere between inhalation and edibles. THC absorbs through the thin tissue beneath your tongue directly into your bloodstream, bypassing the digestive system. Effects typically begin within 10 to 15 minutes. If you swallow the tincture instead of holding it under your tongue, it behaves like an edible, with a slower onset and longer duration.
Why Duration Varies From Person to Person
Two people can smoke the same joint and have noticeably different experiences in both intensity and length. Several factors explain this:
- Body fat. THC is fat-soluble, meaning your body stores it in fatty tissue and releases it slowly over time. People with higher body fat percentages may experience a longer tail of subtle effects.
- Metabolism. A faster metabolic rate breaks down THC more quickly, shortening the active window.
- Tolerance. Regular users develop tolerance to THC, which compresses both the intensity and perceived duration of a high. A daily user might feel sober after an hour from the same dose that keeps an infrequent user elevated for three.
- Dose and potency. Higher doses simply take longer to metabolize. A 5 mg edible and a 50 mg edible are not just different in intensity; the 50 mg dose will last meaningfully longer.
Impairment Lasts Longer Than the High
This is the part most people underestimate. The subjective feeling of being high fades well before THC fully clears your system. Slower reaction times, reduced concentration, and impaired short-term memory can persist for hours after you feel “normal” again. Health Canada notes that cannabis-related impairment of mental alertness and physical coordination can last up to 24 hours.
Canadian physician guidelines recommend waiting at least 6 hours after inhaling cannabis before driving, and at least 8 hours after eating an edible. Some occupational safety bodies recommend a 24-hour window before operating vehicles or heavy equipment, particularly in high-stakes or cognitively demanding situations where subtle impairment could matter.
How Long THC Stays Detectable
The high may be over in a few hours, but THC metabolites remain in your body far longer. THC’s elimination half-life ranges from 14 to 38 hours, meaning it takes that long for your body to clear just half of it.
For urine testing after a single use, cannabis is typically detectable for 3 to 4 days at the standard 50 ng/mL cutoff used by most drug screens. At a more sensitive 20 ng/mL cutoff, that window extends to about 7 days. Regular or heavy users can test positive for weeks or even longer, because THC accumulates in fat tissue with repeated use and releases gradually.
Blood tests detect THC for a shorter window, usually 1 to 2 days for occasional users. Saliva tests typically pick it up for 24 to 72 hours. Hair tests can detect cannabis use for up to 90 days, though they reflect patterns of use rather than a single session.
Next-Day Effects
Some people report a “weed hangover,” particularly after high doses or edibles consumed late at night. Common next-day symptoms include fatigue, brain fog, difficulty concentrating, and sluggish reaction times. These aren’t as dramatic as an alcohol hangover, but they’re real and well-documented. Health Canada lists sleepiness, impaired memory, reduced concentration, and slower reaction times among the short-term effects that can persist for up to 24 hours after use. Higher doses and edibles are more likely to produce these lingering effects than a small amount of smoked flower.