A THC high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you high for 6 to 8 hours. The exact duration depends on how you consume it, how much you take, how often you use cannabis, and your body composition. Here’s what to expect for each method and the factors that shift your personal timeline.
Smoking and Vaping: 1 to 3 Hours
When you inhale cannabis, whether from a joint, pipe, bong, or vape pen, THC enters your bloodstream through your lungs almost instantly. You’ll feel the first effects within seconds to a few minutes. The high peaks around 30 minutes after your first inhale and then gradually tapers off, with total effects lasting up to 6 hours for heavier sessions, though most people find the core “high” window falls in that 1 to 3 hour range.
Flower and concentrates (dabs) follow a similar overall duration of 1 to 3 hours, but concentrates hit faster and harder. Dabs reach their peak at 15 to 30 minutes with intense, sharp cerebral effects, while flower peaks later at 30 to 60 minutes with a more balanced experience. The key difference isn’t how long the high lasts but how intensely it hits and how quickly your tolerance climbs. Daily dabbing with products at 70 to 90% THC pushes tolerance up much faster than flower at 15 to 25% THC, which means you’ll feel the effects for a shorter period over time.
Edibles: 6 to 8 Hours
Edibles take 30 to 60 minutes to kick in, sometimes longer. Peak blood levels of THC don’t arrive until about three hours after you eat them. An edible high generally lasts 6 to 8 hours, roughly double or triple the duration of inhaled cannabis.
The reason edibles last so much longer comes down to how your body processes THC when you swallow it. Instead of passing through your lungs directly into your blood, THC travels through your digestive system and into your liver first. There, liver enzymes convert it into a different active compound that crosses into the brain more easily and produces a stronger, longer-lasting effect. This is why a 10mg edible can feel dramatically more potent than a few puffs of a joint, even if the total THC is similar. It’s also why the most common mistake with edibles is taking a second dose before the first one kicks in.
Tinctures and Sublingual Products
Cannabis tinctures held under the tongue offer a middle ground between smoking and edibles. The tissue under your tongue absorbs THC directly into your bloodstream, bypassing the liver. Effects arrive within 2 to 10 minutes, making the onset closer to smoking. But the high is shorter than edibles, typically wearing off within 1 to 2 hours.
If you swallow a tincture instead of holding it under your tongue, it behaves more like an edible, with a slower onset around 30 to 60 minutes and effects lasting 3 to 6 hours. How you use the product matters as much as the product itself.
What Affects Your Personal Timeline
Five main factors determine whether your high lasts closer to the short or long end of these ranges.
- Dose: Higher doses produce longer-lasting effects. Cognitive impairment after THC declines in a dose-dependent way, meaning more THC simply takes more time to clear.
- Tolerance: Regular users metabolize THC more efficiently and report shorter, less intense highs. Frequent high-potency sessions accelerate tolerance building the fastest.
- Body fat: THC is fat-soluble and accumulates in fatty tissue. People with higher body fat percentages store more THC, which slowly diffuses back into the bloodstream over time. Research has found THC in human fat tissue up to 28 days after a single exposure, and exercise or fasting can temporarily release stored THC back into circulation. This doesn’t necessarily extend the acute high, but it can contribute to lingering low-level effects.
- Metabolism: Genetic differences in the specific liver enzymes that break down THC mean some people clear it significantly faster than others, even at the same dose and body weight.
- Empty vs. full stomach: For edibles, eating on an empty stomach can speed up onset but may also intensify the peak. A full stomach delays absorption but may produce a more gradual experience.
How Long Impairment Actually Lasts
The “high” feeling and the actual cognitive impairment don’t always end at the same time. A large review of medical cannabis studies found that measurable impairment in memory, reaction time, attention, and coordination resolves within 4 hours after inhaling THC, regardless of whether someone uses cannabis daily or occasionally. After 4 hours of recovery, no study found a difference between THC users and placebo on any cognitive measure.
Canadian medical guidelines recommend waiting at least 3 to 4 hours after inhaling cannabis and 6 to 8 hours after eating an edible before doing anything safety-sensitive like driving. If you felt any euphoria, the recommendation extends to 8 hours. There is no nationally agreed-upon THC impairment limit equivalent to the 0.08 blood alcohol standard for drunk driving, which makes personal judgment and conservative timing especially important.
The “Weed Hangover” Window
Many people report feeling foggy, sluggish, or slightly off the morning after using cannabis, particularly after high-dose edibles. While the acute high is long gone, THC’s slow release from fat tissue and the lingering presence of its breakdown products can produce subtle residual effects. This is more common with edibles, higher doses, and infrequent users whose systems aren’t accustomed to processing THC efficiently. Staying hydrated, getting adequate sleep, and choosing lower doses all reduce the likelihood of waking up feeling hazy.