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 exact duration depends on how you consume it, how much you use, and your individual tolerance. Here’s what to expect from each method and why the experience varies so much from person to person.
Smoking and Vaping: 1 to 3 Hours
When you smoke or vape cannabis, the effects hit fast. You’ll feel the high within minutes, and it peaks around 10 minutes after your first inhale. From there, the intensity gradually tapers off over the next 1 to 3 hours, though mild lingering effects can stretch up to 8 hours in some cases.
The rapid onset happens because THC passes directly from your lungs into your bloodstream, reaching your brain almost immediately. This also means the high fades faster compared to other methods, since the THC is metabolized relatively quickly once it peaks. Most people feel essentially back to baseline within 2 hours of a moderate session.
Edibles: 6 to 8 Hours
Edibles are a completely different experience in terms of timing. They take 30 to 60 minutes to kick in because the THC has to pass through your digestive system and liver before entering your bloodstream. Peak effects hit around 3 hours after you eat them, and the full high generally lasts 6 to 8 hours.
That slow buildup is what catches people off guard. Because you don’t feel anything for the first half hour or longer, it’s tempting to take more, thinking the first dose didn’t work. By the time both doses hit their peak, you’re dealing with a much more intense and longer experience than you planned for. If you’re newer to edibles, waiting at least 2 hours before considering a second dose gives the first one enough time to fully develop.
The liver also converts THC into a more potent form (called 11-hydroxy-THC) during digestion, which is partly why edible highs feel stronger and last so much longer than smoking the same amount of THC.
Concentrates and Dabs
Dabs and other concentrates deliver a much higher dose of THC per hit, so you might expect the high to last proportionally longer. In practice, the duration is similar to flower: effects begin within seconds, peak at 15 to 30 minutes, and last 1 to 3 hours. The main difference is intensity, not length. A dab high hits harder and peaks faster, but the overall timeline stays in the same range as smoking regular flower.
Flower, by comparison, takes slightly longer to come on (2 to 5 minutes) and peaks a bit later, around 30 to 60 minutes in. But the total window of 1 to 3 hours is roughly the same for both.
What Makes Your High Shorter or Longer
The ranges above are averages. Several factors push your individual experience toward the shorter or longer end:
- Dose: More THC means a longer, more intense high. This is the single biggest variable you can control.
- Tolerance: Regular users metabolize THC more efficiently and often experience shorter, less intense highs from the same dose.
- Body composition: THC is fat-soluble, so it gets stored in fat tissue. People with higher body fat percentages may process THC differently, and occasional users can sometimes feel residual effects longer as stored THC releases slowly.
- Metabolism: A faster metabolism clears THC from your system more quickly. Younger people and those who are more physically active tend to process it faster.
- What you’ve eaten: Smoking on an empty stomach can produce a faster, slightly more intense peak. For edibles, eating them with fatty foods can increase absorption and extend the experience.
The Afterglow and Residual Effects
Even after the main high wears off, you may not feel entirely “normal” for a while. Many people describe a foggy, slightly sluggish feeling for several hours after the psychoactive effects fade. This is sometimes called the “afterglow” or “comedown,” and it’s more noticeable with edibles or higher doses.
Research from the Drug Enforcement Administration’s education program notes that problems with memory, focus, and processing speed can persist well beyond the subjective high. For occasional use, this typically clears within a day. For frequent, heavy use, some cognitive sluggishness can linger for weeks after stopping.
Why Blood THC Levels Don’t Tell the Full Story
One surprising finding: your THC blood level doesn’t reliably predict how impaired you actually are. A study from the National Institute of Justice found that THC levels in blood, urine, and oral fluid did not correlate with cognitive or psychomotor impairment. Some participants showed significantly decreased functioning even when their THC levels were low, while others with higher levels performed better.
This matters for a practical reason. You can’t rely on “feeling sober” as proof that your reaction time and judgment are fully back to normal. The CDC’s guidance on cannabis and driving reflects this uncertainty: they note it’s difficult to connect THC concentration to driving impairment for any individual person, and the safest approach is to avoid driving after using cannabis at all. As a rough guideline, most sources suggest waiting at least 6 hours after smoking and longer after edibles, though individual impairment varies widely.
Quick Reference by Method
- Smoking/vaping: Onset in minutes, peak at 10 minutes, lasts 1 to 3 hours
- Edibles: Onset in 30 to 60 minutes, peak at 3 hours, lasts 6 to 8 hours
- Dabs/concentrates: Onset in seconds, peak at 15 to 30 minutes, lasts 1 to 3 hours