Edible cannabis effects typically last 6 to 12 hours, with some residual grogginess lingering up to 24 hours after a strong dose. That’s significantly longer than smoking or vaping, which usually wear off within 2 to 3 hours. The reason for the difference comes down to how your body processes THC when you swallow it versus inhale it.
The Full Timeline From Start to Finish
Edibles follow a slow arc. You’ll start feeling effects somewhere between 30 minutes and 2 hours after eating one. The high builds gradually from there, reaching its peak around 4 hours in. The intoxicating effects can then persist for up to 12 hours total, depending on the dose and your individual metabolism.
For comparison, here’s how that breaks down in practice. If you eat an edible at 7 p.m., you might not feel anything until 8 or 9 p.m. The strongest effects would hit around 11 p.m. You could still feel noticeably high at 3 or 4 a.m., and some lingering heaviness or brain fog could stick around into the next morning. A lower dose (5 mg or less) will typically run a shorter course, closer to 4 to 6 hours of noticeable effects.
Why Edibles Last So Much Longer Than Smoking
When you smoke or vape cannabis, THC enters your bloodstream through your lungs and hits your brain almost immediately. It also clears out fast. Edibles take a completely different route. THC travels through your stomach and into your liver, where enzymes convert it into a different compound called 11-hydroxy-THC. This metabolite crosses into the brain more efficiently than regular THC and produces a stronger, longer-lasting effect at the same dose.
This liver processing, called first-pass metabolism, is the reason edibles feel different from smoking. The high tends to be more physical, more intense, and slower to build and fade. It’s also why eating the same number of milligrams that you’d smoke can feel dramatically more powerful.
Why Duration Varies So Much Between People
You’ve probably noticed that the same edible can flatten one person for 10 hours while barely registering for someone else. Several factors explain this spread.
- Genetics: About 10 to 15% of people carry genetic variations that make their liver enzymes process THC much faster or slower than average. Slow metabolizers may experience prolonged, intense effects. Fast metabolizers might feel very little from the same dose, or the effects may fade unusually quickly.
- Tolerance: Regular cannabis users metabolize THC more efficiently and generally experience shorter, less intense effects from edibles.
- Body composition: THC is fat-soluble, so it gets stored in fat tissue and released gradually. People with higher body fat percentages may experience a longer tail of mild effects.
- Stomach contents: Eating an edible on a full stomach slows absorption and can delay onset by an hour or more, pushing the entire timeline later. An empty stomach speeds things up.
- Dose: This is the biggest controllable factor. A 5 mg edible will run its course much faster than a 50 mg one. Higher doses simply take longer for your body to clear.
The Next-Day “Hangover” Effect
After a strong edible, you may not feel fully sharp the next morning. Commonly reported next-day symptoms include fatigue, brain fog, dry mouth, dry eyes, mild headache, and a general feeling of sluggishness. This isn’t a true hangover in the way alcohol produces one, but the residual THC still circulating in your system can leave you feeling off.
If you took a high dose, THC levels in your blood the following morning may still be elevated enough that you feel mildly high. There’s no set duration for this. Some people feel completely normal 8 hours after a moderate dose, while others notice residual effects for most of the next day. Staying hydrated, sleeping well, and eating a solid meal the morning after all help your body clear the remaining THC faster.
How Long Before You’re Safe to Drive
The Colorado Department of Transportation advises that edibles can impair you for at least 8 hours, and some products cause intoxicating effects lasting longer than 12 hours. Unlike alcohol, there’s no simple formula to calculate when you’re sober enough to drive. The slow, unpredictable absorption of edibles makes it especially hard to judge your own impairment level.
The safest approach is to plan for the entire evening and following morning. If you eat a moderate to high dose edible in the evening, waiting until the next afternoon to drive is reasonable. If you still feel foggy or slow, you’re still impaired.
How Long THC Stays Detectable
Feeling sober and testing clean are two very different timelines. Even after all noticeable effects have worn off, THC metabolites remain in your system for days or weeks depending on how often you use cannabis.
For a single use, a standard urine drug test (using the common 50 ng/mL cutoff) will typically detect THC for 3 to 4 days. A more sensitive test at the 20 ng/mL cutoff can pick it up for about 7 days. Regular users accumulate THC in fat tissue over time, which extends the detection window to several weeks or even longer in heavy daily users. The form of consumption (edible versus smoked) doesn’t significantly change how long you’ll test positive, since the same metabolites end up in your urine either way.