A cannabis high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling high for 6 to 8 hours. But the full picture is more nuanced than that. How you consumed it, how much you took, and how often you use cannabis all shift the timeline significantly, and some effects linger well after the high itself fades.
Smoking and Vaping: The Fastest Timeline
When you smoke or vape cannabis, THC enters your bloodstream through your lungs almost instantly. It’s detectable in blood within seconds of the first inhale, and levels peak within 3 to 10 minutes. That rapid spike is why the high hits so quickly and feels so immediate.
The noticeable effects, the euphoria, altered perception, and relaxation, generally last 1 to 3 hours for most people. That said, lingering effects like mild drowsiness or a slightly “off” feeling can stick around for up to 8 hours, especially with higher-potency products. The strength of what you’re smoking matters a lot here. A few puffs of a low-THC strain and a full session with a high-potency concentrate are not the same experience, and they don’t wear off on the same schedule.
Edibles Take Longer to Hit and Last Longer
Edibles follow a completely different timeline. They typically take 30 to 60 minutes to kick in, though some people don’t feel anything for up to 2 hours. This delay catches a lot of people off guard, leading them to take more before the first dose has even started working.
The reason edibles hit differently is biological. When you eat THC, your liver converts it into a metabolite that is more potent and has a longer effective half-life than THC itself. This is why edible highs feel stronger and more full-body to many people. Blood levels of THC from edibles peak around 3 hours after you eat them, compared to minutes for smoking. The total high generally lasts 6 to 8 hours, with some residual effects stretching beyond that.
Why It Varies So Much Between People
Several factors determine where you fall on these timelines. Dose is the most obvious: more THC means a longer, more intense experience. But your personal biology and usage history matter just as much.
THC is fat-soluble, meaning it gets stored in your body’s fat tissue and released slowly over time. If you use cannabis regularly, you build up a reservoir of THC and its metabolites in your body. Chronic users accumulate more stored THC than occasional users, which affects both how long the high feels and how long THC remains detectable in your system afterward. Your metabolism, body composition, and even hydration levels all play a role in how quickly your body processes and clears THC.
Tolerance also shifts the subjective experience. Someone who smokes daily may feel functionally normal after an hour, while an occasional user could feel noticeably altered for 3 or 4 hours from the same product.
Impairment Lasts Longer Than the High
Here’s the part that catches people off guard: you can feel “back to normal” while still being measurably impaired. Research shows that cognitive effects from cannabis, particularly in areas like memory, processing speed, and decision-making, persist after the subjective feeling of being high has passed. For regular users, measurable cognitive effects can linger for days or even weeks into abstinence, particularly in learning and memory tasks.
This gap between feeling sober and actually being sober has real safety implications. Colorado’s Department of Transportation recommends waiting at least 6 hours after smoking cannabis (at doses under 35 mg THC) before driving, and at least 8 hours after eating an edible (at doses under 18 mg THC). Higher doses require even longer waits. If you’ve combined cannabis with alcohol, the effects of both are amplified, and you need to wait significantly longer. Some products sold on the unregulated market can produce intoxicating effects lasting beyond 12 hours.
The “Weed Hangover” the Next Day
Some people feel off the day after using cannabis, reporting symptoms like fatigue, brain fog, dry mouth, dry eyes, headaches, and mild nausea. A 2019 study found that smoking cannabis could lead to noticeable daytime fatigue the following day. The scientific evidence on this “weed hangover” is mixed, though. Some studies find measurable cognitive effects the next day, while many do not. Not everyone experiences it, and when it does happen, there’s no set duration.
What increases the likelihood of next-day effects is predictable: higher doses, more potent products, edibles (which process through your system more slowly), and lower personal tolerance. If you’re newer to cannabis or returning after a break, you’re more likely to feel groggy or foggy the morning after.
How Long THC Stays Detectable
The high wearing off and THC leaving your body are two very different timelines. If you’re concerned about a drug test, the detection window depends heavily on how often you use cannabis.
For a single use, THC metabolites are typically detectable in urine for about 3 to 4 days at standard testing thresholds, or 1 to 2 days at the most common cutoff level. A higher-dose single session extends that to 3 to 6 days. For chronic daily users, the picture changes dramatically. In one study of long-term daily users, only 5 out of 17 participants cleared detectable levels within the first week of stopping. Four more cleared during the second week, two during the third, and six still had detectable levels after 28 days of abstinence.
That said, more recent analysis suggests that at standard testing cutoffs, it would be unlikely for even a chronic user to produce a positive urine test more than 10 days after their last session. The extreme cases of 3 to 4 weeks of detection are real but represent the tail end of the range, typically at lower, more sensitive testing thresholds.