A weed high from smoking or vaping typically lasts 1 to 3 hours, while an edible high can last 6 to 8 hours or longer. The difference comes down to how your body absorbs and processes THC, and several factors like dose, tolerance, and product type can shift that window significantly in either direction.
Smoking and Vaping: 1 to 3 Hours
When you inhale cannabis, THC passes through your lungs directly into your bloodstream. You’ll feel the first effects within 2 to 10 minutes, usually starting as a head rush or a shift in how sounds, colors, or textures feel. The high reaches its peak intensity around 20 to 45 minutes in, when THC concentration in your blood is at its highest. From there, effects gradually taper off over the next hour or two.
For most people, the core experience wraps up within 1 to 3 hours. But that doesn’t mean you’ll feel completely normal at the three-hour mark. New users, people who took a large dose, or anyone using high-potency products may notice lingering drowsiness or mild brain fog for 4 to 8 hours after the initial hit. Dabbing, which involves vaporizing concentrated products like wax or shatter, delivers a much larger dose of THC at once. That can push the high to the upper end of the range, sometimes lasting up to 4 hours, particularly if your tolerance is low.
Edibles: 6 to 8 Hours (Sometimes Longer)
Edibles follow a completely different timeline. They take 30 to 60 minutes to kick in, though some people don’t feel anything for up to 2 hours. This slow onset is the main reason people accidentally take too much: they eat a gummy, feel nothing after 45 minutes, take another one, and then both doses hit at once.
Peak blood levels of THC from edibles occur around 3 hours after you eat them. The total high generally lasts 6 to 8 hours, but according to British Columbia’s public health guidelines, the intoxicating effects can stretch up to 12 hours, with residual effects lingering up to 24 hours in some cases. That’s a massive difference compared to smoking, and it catches a lot of people off guard.
Why Edibles Hit Harder and Last Longer
The reason is your liver. When you swallow THC, it passes through your digestive system and gets processed by the liver before reaching your brain. During that process, your liver converts THC into a metabolite called 11-hydroxy-THC, which is itself psychoactive and crosses into the brain more readily. After oral ingestion, blood levels of this metabolite can be significantly higher than after inhalation. You’re essentially getting a double dose of psychoactive compounds, which explains why a 10mg edible can feel far more intense than a quick hit from a joint.
How Dose Changes the Timeline
The amount of THC you consume is one of the biggest factors in how long the high lasts. For edibles, public health guidelines recommend starting at 2.5mg of THC or less. At that dose, you can gauge your personal response without being overwhelmed. Many people find 2.5mg is enough on its own. If you want to increase, the standard advice is to wait at least two hours before taking another 2.5mg dose, since the full effects of the first dose may not have arrived yet.
Higher doses don’t just make the high stronger. They make it last longer. Someone who eats a 5mg gummy might feel effects for 4 to 6 hours. Someone who takes 20mg or more could still feel intoxicated well into the next day. With inhalation, the same principle applies on a shorter scale: a single puff from a low-potency joint might wear off in under an hour, while a heavy session with concentrates can stretch the experience considerably.
The Next-Day Hangover
Some people wake up the morning after using cannabis and feel noticeably off. Commonly reported symptoms include fatigue, brain fog, dry mouth, dry eyes, headaches, and mild nausea. This isn’t universal. Many people feel fine the next day, and whether you experience it depends on the dose, the product, and your individual tolerance.
If THC levels in your blood are still elevated the following morning, you may actually still be mildly high rather than hungover. This is more likely after large edible doses or heavy evening sessions. There’s no set timeline for how long these residual symptoms last, but they typically clear within a few hours of waking up.
How Long Impairment Actually Lasts
Feeling sober and being fully unimpaired aren’t always the same thing. The subjective high may fade after a few hours, but subtle effects on reaction time, attention, and coordination can persist beyond what you notice. This matters most for driving. The largest study on the topic, conducted by researchers at UC San Diego, found that frequent cannabis users showed no measurable driving impairment after at least 48 hours of abstinence. That two-day window is a useful reference point, though occasional users or anyone who consumed a large dose should be especially cautious, since THC can affect them more strongly and for longer than it affects regular users.
For practical purposes: if you smoked a small amount, waiting several hours before driving is a reasonable minimum. After edibles, especially at moderate or high doses, the safest approach is to avoid driving for the rest of the day.
Factors That Shift Your Timeline
- Tolerance: Regular users metabolize THC more efficiently and typically experience shorter, less intense highs than occasional users.
- Body composition: THC is fat-soluble, so it’s stored in fat tissue and released slowly. People with higher body fat percentages may experience longer-lasting residual effects.
- Metabolism: A faster metabolism processes THC more quickly, which can shorten the high but also speed up the conversion to active metabolites.
- Consumption method: Smoking and vaping produce the shortest highs. Edibles last the longest. Concentrates like dabs fall somewhere in between for duration but tend to hit harder at the peak.
- Potency: Higher-THC products produce longer and more intense effects at the same volume of consumption.
- Food intake: Eating edibles on an empty stomach can speed up onset slightly, while a full stomach may delay it. For inhalation, food intake has minimal impact on the high itself.