A marijuana high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling effects for up to 10 to 12 hours. But the full picture is more nuanced than a single number. How you consumed it, how much you took, and your individual biology all shift the timeline significantly.
Smoking and Vaping: The Fastest Timeline
When you smoke or vape cannabis, THC enters your bloodstream almost immediately. Detectable levels appear in blood within about 2 minutes of the first puff, and blood concentrations peak around 9 minutes in. The high itself peaks shortly after you finish and generally lasts 1 to 3 hours, though lingering effects can stretch to 8 hours with higher doses.
This fast-in, fast-out pattern is what makes inhalation the most predictable method. You feel it quickly, so you have a better sense of how strong the effects are before you consume more. The tradeoff is that the peak hits hard and early, which can catch newer users off guard.
Edibles: A Much Longer Experience
Edibles follow a completely different timeline. Because THC has to pass through your digestive system and liver before reaching your brain, onset takes 30 to 90 minutes. Peak effects hit between 2 and 4 hours in, and the entire experience can last up to 10 to 12 hours.
The delayed onset is what makes edibles tricky. Many people don’t feel anything after 45 minutes, take more, and then find themselves dealing with a much stronger high than they intended once everything kicks in at once. The liver also converts THC into a more potent form during digestion, which is why edible highs often feel qualitatively different from smoking: heavier, more body-focused, and longer lasting.
Another quirk of edibles is that blood THC levels don’t always follow a smooth curve. Research on oral consumption found that while most people peak between 1 and 2 hours, some don’t reach peak blood levels until 6 hours in. Some people experience more than one peak. This unpredictability is unique to the oral route.
Tinctures and Oils Under the Tongue
Sublingual products (drops or tinctures held under the tongue) split the difference between smoking and edibles. Effects begin within 5 to 10 minutes as THC absorbs through the thin tissue under your tongue directly into the bloodstream. The high peaks around 30 to 45 minutes and typically wears off within 1 to 2 hours. This makes sublingual dosing one of the shortest and most controlled methods available.
Why It Lasts Longer for Some People
Two people can smoke the same amount and have noticeably different experiences in both intensity and duration. Several factors explain this.
Genetics play a larger role than most people realize. Roughly one in four people carry a gene variant that causes their liver enzymes to break down THC less efficiently. If you’re one of them, the effects are stronger and last longer because the active compound stays in your system instead of being converted into inactive byproducts. Research from the Medical University of South Carolina found that this slower metabolism, combined with today’s higher-potency cannabis products, can significantly amplify and extend the experience.
Body composition matters too. THC is fat-soluble, meaning it gets absorbed into fatty tissue and released slowly over time. People with a higher percentage of body fat tend to experience longer-lasting effects and slower clearance. Frequency of use also shifts the equation. Regular users build tolerance, which shortens and dulls the perceived high. But paradoxically, frequent use also means more THC is stored in fat tissue, which can extend subtle background effects.
Dose and potency are the most obvious variables. A single hit from a low-potency strain will wear off much faster than multiple dabs of a high-THC concentrate. This sounds straightforward, but many people underestimate how much potency varies between products.
The “Weed Hangover” the Next Day
Even after the high itself fades, some people experience residual effects the following day. Commonly reported symptoms include fatigue, brain fog, dry mouth, dry eyes, headaches, and mild nausea. This is sometimes called a weed hangover, and while not everyone gets one, it’s more likely after high doses or potent edibles.
There’s no fixed duration for these aftereffects. For some people they clear within an hour or two of waking up. Others feel slightly off for most of the day. In some cases, high levels of THC remain in the blood the morning after use, which can leave a person still feeling mildly high rather than just groggy. The method of consumption, dose strength, and individual tolerance all influence whether you’ll feel anything the next day.
How Long Impairment Actually Lasts
Feeling sober and being fully unimpaired are not the same thing. Driving studies show that maximal impairment from smoking occurs 20 to 40 minutes after use and decreases over the following hours. However, research also documents residual crash risk when cannabis is used within 4 hours of driving. Clinical research protocols require participants to wait at least 4 hours after consuming THC before driving or operating heavy machinery, which gives you a reasonable baseline for planning.
With edibles, the safe window is longer. Since effects can persist for 10 to 12 hours and peak timing is unpredictable, waiting until the next day before driving is a more realistic guideline after a moderate or high edible dose.
Detection Versus Duration of Effects
The high wears off in hours, but THC metabolites stay detectable in your body far longer. Urine tests can detect marijuana use from 1 day to 5 weeks after your last use, depending on how often you consume, your body fat percentage, and your metabolism. A single use by an occasional consumer might clear in a few days. Chronic daily use can remain detectable for a month or more.
Physically inactive people and those with higher body fat percentages are especially prone to extended detection windows because THC accumulates in fat tissue and releases gradually. This has no connection to how long you feel high. It simply means the chemical evidence lingers long after the psychoactive effects are gone.