A cannabis high typically lasts 1 to 3 hours when smoked or vaped, and 6 to 8 hours when eaten as an edible. But the real answer depends on how you consumed it, how much you took, and your individual biology. Here’s what to expect for each method and the factors that shift that timeline.
Smoking and Vaping: 1 to 3 Hours
When you inhale cannabis, effects begin within minutes and peak almost immediately. The intense part of the high usually lasts 1 to 3 hours, though some lingering effects can stretch to 8 hours depending on the dose. Most people feel essentially back to normal within 3 to 4 hours of a moderate session.
A National Institute of Justice study that tracked cognitive performance after vaping found that working memory and balance were affected right away, while reaction time and the ability to split attention between tasks took about an hour to show measurable decline. Peak impairment generally fell between 0 and 2 hours after dosing, and performance returned to baseline by the 4-hour mark. So even after the subjective high fades, your brain may still be catching up for another hour or two.
Edibles: 6 to 8 Hours
Edibles follow a completely different timeline because THC has to pass through your digestive system and liver before reaching your brain. Onset typically takes 30 to 60 minutes, though it can take longer on a full stomach. Peak blood levels of THC arrive around 3 hours after eating, which is when the high feels strongest.
The total experience generally lasts 6 to 8 hours, and the same NIJ study confirmed that cognitive and motor impairment from oral THC didn’t even begin until an hour after dosing, peaked around 5 hours in, and didn’t return to near-baseline levels until about 8 hours. That slow ramp-up is why edibles catch people off guard. Taking a second dose because “nothing is happening” after 45 minutes is one of the most common mistakes, and it can turn a manageable experience into an uncomfortably intense one lasting well into the next morning.
Concentrates and Dabs: Intense but Similar Duration
Dabbing or vaping concentrates delivers THC at 60 to 80%, compared to 10 to 30% in regular cannabis flower. Effects begin within seconds to minutes and feel significantly more intense. Despite that intensity, the duration is roughly the same as smoking flower: 1 to 3 hours. The delivery method (inhalation through the lungs) is identical, so the body processes it on a similar timeline. What changes is how high you get, not necessarily how long.
That said, a very large dose of concentrate can push the tail end of effects further out, particularly for someone with low tolerance.
Why Your High Might Last Longer (or Shorter) Than Expected
Several biological factors create real variation from person to person:
- Genetics. About 1 in 4 people carry a gene variant that causes their liver enzymes to break down THC less efficiently. If you’re in that group, the same dose will hit harder and last longer than it does for friends who metabolize it quickly. Research from the Medical University of South Carolina found this genetic difference can meaningfully increase both the intensity and duration of effects.
- Tolerance. Frequent users develop tolerance that shortens and dulls the high. Someone who smokes daily may feel effects for an hour or less from a dose that would keep an occasional user high for three.
- Dose. This is the single biggest variable you can control. A 5 mg edible and a 50 mg edible aren’t just different in intensity; the higher dose will keep you impaired for significantly longer because your body needs more time to process the THC.
- Body composition. THC is fat-soluble, meaning it gets stored in fat tissue and released slowly. People with higher body fat percentages may experience slightly prolonged effects, especially with repeated use.
- Food intake. Eating a fatty meal before consuming cannabis (especially edibles) can increase THC absorption and extend the experience.
The High Fades Before Impairment Does
One of the most important things to understand is that feeling sober and being sober are not the same thing. Research from the University of Alberta found clear evidence that memory, focus, distractibility, and fine motor skills remain impaired for at least 1 to 3 hours after consuming cannabis, with uncertainty about how much longer subtle deficits persist. The NIJ study showed that after vaping, measurable cognitive impairment lasted up to 4 hours, and after edibles, up to 8 hours.
Interestingly, THC blood levels don’t reliably predict how impaired someone actually is. The same NIJ study found that many participants had low THC in their blood at timepoints where their cognitive performance was still substantially decreased. Others had detectable THC but performed normally. This disconnect is why there’s no breathalyzer equivalent for cannabis, and it means you can’t rely on “I don’t feel that high anymore” as a signal that you’re safe to drive or handle anything requiring sharp coordination.
Quick Reference by Method
- Smoking/vaping flower: onset in minutes, peaks immediately, lasts 1 to 3 hours, residual impairment up to 4 hours
- Concentrates/dabs: onset in seconds to minutes, more intense peak, lasts 1 to 3 hours
- Edibles: onset in 30 to 60 minutes, peaks around 3 to 5 hours, lasts 6 to 8 hours, residual impairment up to 8 hours
If you’re waiting for effects to wear off before doing something that requires full attention, add at least 1 to 2 hours beyond when you feel “normal” as a buffer, especially with edibles.