A cannabis high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you high for 6 to 8 hours. The actual duration depends heavily on how you consumed it, how much THC was involved, and your individual biology. Here’s what to expect for each method and what influences the timeline.
Smoking and Vaping
When you inhale cannabis, whether from a joint, pipe, or vaporizer, effects hit within 1 to 2 minutes. The high peaks around 15 to 30 minutes after your first inhale for concentrates (dabs), or 30 to 60 minutes for regular flower. From there, the intensity tapers off and the main effects last 1 to 3 hours total, though some lingering effects can stretch longer.
Standard cannabis flower contains 15 to 25% THC, while concentrates pack 60 to 90%. Despite that massive potency difference, the overall duration is surprisingly similar for both. The experience feels different, though. Flower builds gradually as multiple compounds activate together, which many people describe as a steady, balanced high. Dabs hit all at once with a sharp, intense onset that fades at roughly the same pace.
Edibles
Edibles follow a completely different timeline because THC has to pass through your digestive system before reaching your bloodstream. Expect to wait 30 to 60 minutes before feeling anything, though it can take up to 2 hours for some people. This delay is why inexperienced users sometimes eat more, thinking the first dose didn’t work, and end up uncomfortably high.
Peak intensity arrives around 2 to 3 hours after eating. The total high generally lasts 6 to 8 hours, with some people reporting effects that linger up to 24 hours at higher doses. Because of the slow onset and long duration, edibles are harder to dose precisely. If you’re new to them, starting with a low dose and waiting at least 2 hours before taking more gives you the best chance of a comfortable experience.
Tinctures and Sublingual Oils
Tinctures and oil drops placed under the tongue split the difference between smoking and edibles. THC absorbs through the thin tissue under your tongue and enters the bloodstream within 5 to 10 minutes. Effects peak around 30 to 45 minutes and typically wear off within 1 to 2 hours, making this one of the shortest-lasting methods. If you swallow the oil instead of holding it under your tongue, it behaves more like an edible, with a slower onset and longer duration.
Why Your High Might Last Longer (or Shorter) Than Expected
Several factors shift the timeline in either direction, sometimes significantly.
Genetics. About one in four people carry a gene variant that causes their liver enzymes to break down THC less efficiently. For these slower metabolizers, the same dose produces a stronger and longer-lasting high. Researchers at the Medical University of South Carolina found that rising THC potency in modern cannabis amplifies this effect, meaning slower metabolizers feel the increase in today’s stronger products more than others do.
Tolerance. If you use cannabis daily or multiple times a day, your body develops partial or full tolerance to THC’s effects. Studies consistently show that occasional users experience stronger, longer-lasting impairment from the same dose compared to regular users. Heavy, long-term users sometimes show full tolerance to certain effects, meaning they feel high for a noticeably shorter window. People who use cannabis a few times a week or less generally don’t develop meaningful tolerance.
Dose and potency. Higher doses extend the timeline. This applies across all methods but matters most with edibles, where the already-long duration can stretch well beyond 8 hours at higher doses.
Body composition and metabolism. THC is fat-soluble, so it gets stored in fat tissue and released slowly. People with higher body fat percentages or slower metabolisms may notice effects lingering longer. Food in your stomach also matters for edibles: eating one on an empty stomach can speed up onset but may also intensify the experience.
How Long You’re Actually Impaired
The noticeable high and the actual window of impairment aren’t the same thing. You may feel sober before your coordination, reaction time, and judgment have fully returned. The Colorado Department of Transportation recommends waiting at least 6 hours after smoking cannabis with less than 35 mg of THC before driving, and at least 8 hours after eating an edible with less than 18 mg of THC. Higher doses require waiting even longer.
Combining cannabis with alcohol makes this worse. The two substances amplify each other, extending impairment well beyond what either would cause alone. Some unregulated products can cause impairment lasting more than 12 hours. Memory, attention, and decision-making are the cognitive functions most affected, and in occasional users, these impairments are detectable for 2 to 4 hours after smoking even at relatively low blood THC levels.
Detection vs. Duration of Effects
Your high wears off in hours, but THC metabolites, the byproducts your body creates while breaking down THC, stick around much longer. Drug tests measure these metabolites, not active THC, so a positive result doesn’t mean you’re currently impaired. Blood and saliva tests can detect cannabis use for hours to a couple of days. Urine tests pick it up for days to weeks depending on how often you use. Hair tests can detect metabolites for months. A single use clears your system faster than regular use, since THC accumulates in fat tissue over time with repeated consumption.
Can You End a High Faster?
You may have heard that chewing black peppercorns or taking CBD can cut a high short. The theory involves a compound in black pepper called beta-caryophyllene that interacts with some of the same receptors as THC. But researchers at Johns Hopkins’ Cannabis Science Laboratory note there is little to no data from controlled experiments supporting any of these remedies. No clinical trials have tested whether peppercorns actually reduce cannabis-induced anxiety or shorten a high in humans.
What does help is time, hydration, a calm environment, and distraction. If you’re uncomfortably high, finding a safe, quiet place and reminding yourself the feeling is temporary and not dangerous is the most reliable approach. Using lower-THC products or products with a balanced ratio of THC to CBD in the first place reduces the chances of an overwhelming experience. Beyond that, the high simply has to run its course.