If you smoked or vaped cannabis, the high typically lasts 2 to 4 hours, though some effects can linger for up to 6 hours. If you ate an edible, you’re looking at a much longer ride: anywhere from 6 to 12 hours, and occasionally longer with higher doses. The exact timeline depends on how you consumed it, how much you took, and how often you use cannabis.
Smoked or Vaped Cannabis
When you inhale cannabis, THC enters your bloodstream through the lungs almost immediately. Blood THC levels peak within about 10 minutes, and the mental and physical effects hit their strongest point between 30 and 60 minutes after your first puff. From there, the high starts to taper.
Your blood THC levels and heart rate generally return to normal within 3 to 4 hours. But here’s the catch: feeling “back to normal” takes longer than the blood chemistry suggests. Subjective effects and measurable cognitive impairment can persist for up to 6 hours on average. In some cases, particularly with higher-potency products, they don’t fully resolve for 6 to 8 hours. So even if you feel mostly fine after 3 hours, your reaction time and attention may still be off.
Edibles Take Much Longer
Edibles follow a completely different timeline because they’re processed through your digestive system before THC reaches your brain. The initial effects take 30 to 90 minutes to appear, which is why Colorado and Oregon require labels warning that intoxicating effects “may not be felt for up to 2 hours.” That delay is also why people sometimes eat a second dose too soon, thinking the first one didn’t work.
Once the high kicks in, it builds slowly. Peak intensity typically hits 2 to 4 hours after eating, with some research showing an average peak around 3 hours. The total duration is significantly longer than smoking. Blood THC levels from oral consumption don’t return to baseline until 6 to 20 hours after the dose, depending on the amount. A standard 10 mg dose tends to peak earlier (around 1 hour) and clear faster, while a 25 or 50 mg dose can take 2 to 6 hours just to reach peak levels.
The reason edibles last so long is biological. When you eat THC, your liver converts it into a different psychoactive compound (called 11-hydroxy-THC) before it reaches your brain. This metabolite is also intoxicating, and it extends the overall duration of the experience compared to inhaled THC, which largely bypasses the liver.
Why It Varies From Person to Person
Two people can consume the same amount of cannabis and have very different experiences. The biggest factor is tolerance. Regular users process THC differently than occasional users. Research shows that the acute effects of a single dose are noticeably less intense in frequent users compared to occasional ones. If you use cannabis daily, your high will likely be shorter and milder than someone who uses it once a month.
Potency matters too. A 5 mg edible and a 50 mg edible aren’t just different in intensity; they’re different in duration. Higher doses take longer to metabolize and clear from your system. The method of consumption, your metabolism, whether you ate recently, and even your individual liver enzyme activity all play a role. There’s no single number that applies to everyone, which is why the ranges above are broad.
The “Weed Hangover” Window
Even after the high is clearly over, some people report feeling foggy, sluggish, or slightly off the next day. The scientific evidence for this is mixed. A systematic review looking at “next day” effects across 16 studies found that the vast majority of performance tests (209 out of the total examined) showed no measurable impairment the following day. A smaller subset of tests conducted 8 to 12 hours after use did find some lingering effects on memory, perception, and divided attention.
The overall takeaway from the research is that a cannabis hangover, when it happens, is likely milder than an alcohol hangover. But it’s not zero. If you consumed a high dose or ate a potent edible late at night, you may still feel somewhat off the next morning.
When You’re Actually Safe to Drive
Feeling sober and being functionally unimpaired aren’t always the same thing. Clinical guidelines recommend waiting at least 5 hours after using a THC-containing product before driving, and that’s considered a conservative minimum for smoked or vaped cannabis. If you mixed cannabis with alcohol, or if you consumed an edible, the wait should be significantly longer. Some experts and jurisdictions with zero-tolerance laws recommend at least 12 hours of abstention before getting behind the wheel. For high-dose edibles, waiting even longer is reasonable given how slowly they clear your system.
Can You Sober Up Faster?
The short answer: not really. There’s no proven way to rapidly end a cannabis high. THC has to be metabolized by your body, and that process takes however long it takes. But a few things may take the edge off.
CBD, when present in a significant proportion relative to THC, appears to modulate some of THC’s psychoactive effects. Research has shown it can reduce THC-induced cognitive and memory impairment. If you have access to a high-CBD product, it may help soften the intensity without necessarily shortening the duration.
Black pepper is a popular folk remedy. There’s a plausible scientific rationale for it: compounds in black pepper interact with some of the same receptor systems as cannabinoids, and may promote mental clarity or mild sedation. But this hasn’t been experimentally proven to shorten a high. The same goes for drinking water or eating acidic fruits. Staying hydrated and eating something may help you feel more grounded, but neither will speed up THC metabolism in any measurable way.
The most reliable strategy is simply time. If you’re uncomfortably high, find a calm environment, remind yourself it will pass, and wait it out. For smoked cannabis, you’ll likely feel substantially better within 2 to 3 hours. For edibles, settling in for a longer wait is the realistic move.