A cannabis high typically lasts 1 to 3 hours when smoked or vaped, and 4 to 12 hours when eaten as an edible. The method you use to consume THC is the single biggest factor in how long the effects stick around, but dose, tolerance, and your individual biology all play a role too.
Smoking and Vaping: 1 to 3 Hours
When you inhale cannabis, THC crosses from your lungs into your bloodstream in seconds. You’ll feel the effects within minutes, and they peak almost immediately. The whole experience typically wraps up within 1 to 3 hours, though some lingering effects can stretch to 8 hours with higher doses.
This is the shortest and most predictable route. Because the onset is so fast, it’s easier to gauge how high you are and stop when you’ve reached the level you want. The tradeoff is that the effects fade relatively quickly compared to other methods.
Edibles: 4 to 12 Hours
Edibles are a completely different experience in terms of timing. When you eat or drink THC, it has to pass through your digestive system and get processed by your liver before it reaches your brain. That means the onset takes 30 to 90 minutes, and the effects don’t peak until 2 to 3 hours in.
Once they hit, edibles last significantly longer: 4 to 12 hours depending on the dose and your metabolism. Residual effects, like grogginess or a mild foggy feeling, can linger for up to 24 hours after a strong dose. This long tail is why edibles catch people off guard. If you eat a gummy, feel nothing after an hour, and take a second one, you may end up dealing with a much more intense and longer high than you bargained for. The British Columbia government’s safe-use guidelines recommend starting at 2.5 mg of THC or less and waiting at least two hours before considering a second dose.
Tinctures, Oils, and Capsules
Sublingual products (oils or tinctures held under the tongue) split the difference between smoking and edibles. THC absorbs through the thin tissue under your tongue and enters the bloodstream more directly than something you swallow. Effects kick in within 5 to 10 minutes, peak around 30 to 45 minutes, and wear off within 1 to 2 hours.
Capsules behave more like edibles because they go through your digestive system. Onset takes 30 to 90 minutes, but the effects can last 6 to 12 hours. These are on the longer end of the spectrum, which is why capsules are often used by people looking for sustained relief from pain or other symptoms rather than a quick, short experience.
How Dose Changes the Timeline
A higher dose doesn’t just make you more high. It also makes you high for longer. A small hit from a joint might produce mild effects for an hour, while several large hits of a high-potency strain can leave you feeling impaired for the better part of an afternoon. With edibles, the relationship between dose and duration is even more dramatic. A 2.5 mg edible might produce a gentle effect that fades in a few hours, while a 50 mg edible can keep you feeling effects for 12 hours with residual grogginess lasting into the next day.
Why It Hits Different for Different People
Two people can take the same dose and have noticeably different experiences. Several factors explain why:
- Genetics: About one in four people carry a gene variant that causes their liver enzymes to break down THC less efficiently. If you’re in that group, the effects will be stronger and last longer than they would for someone else taking the exact same amount. Research from the Medical University of South Carolina found this genetic difference may explain why some people have unexpectedly intense reactions to cannabis.
- Tolerance: Regular cannabis use causes the brain’s cannabinoid receptors to downregulate, meaning they become less responsive over time. Frequent users experience a blunted high compared to occasional users, and in some cases, studies have documented full tolerance to certain acute effects. If you use cannabis daily, you’ll likely find the high feels shorter and weaker than it did when you started.
- Metabolism and body composition: THC is fat-soluble, so your metabolic rate and body fat percentage influence how quickly you process it. A faster metabolism generally means a shorter experience. Whether you’ve eaten recently also matters, especially with edibles. Taking an edible on an empty stomach can produce a faster, more intense onset.
How Long Impairment Actually Lasts
Feeling “back to normal” and actually being back to normal aren’t always the same thing. The subjective high may fade after a few hours, but cognitive and motor impairment can outlast the feeling. The CDC notes that it’s difficult to pin down exactly when impairment ends for any individual person, because THC concentration in the blood doesn’t map neatly onto driving performance the way blood alcohol does.
As a practical guideline, residual impairment from smoking can persist for several hours after the high feels like it’s worn off. With edibles, this window stretches even further. If you’ve taken a strong edible dose, you may not be fully back to baseline for coordination and reaction time until the next day. Planning around this, especially for driving, means building in more buffer time than the high itself seems to require.