A cannabis high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling high for 6 to 10 hours. The actual duration depends on how you consumed it, how much THC you took in, and how often you use cannabis. Here’s what to expect from each method and the factors that shift those timelines.
Smoking and Vaping: 1 to 3 Hours
When you inhale cannabis, whether from a joint, pipe, bong, or vape pen, the effects begin within minutes. THC passes from your lungs into your bloodstream almost immediately, so the high hits fast and peaks quickly. Most people feel the strongest effects within the first 15 to 60 minutes, then a gradual decline over the next couple of hours. The total experience typically wraps up in 1 to 3 hours, though lingering, milder effects can stretch to 8 hours in some cases.
Concentrates (dabs, wax, shatter) deliver a much higher dose of THC per hit, so the peak feels more intense and arrives faster, often within seconds. But the overall duration is surprisingly similar to flower: that same 1 to 3 hour window. The difference is more about intensity than length.
Edibles: 6 to 10 Hours
Edibles follow a completely different timeline because your body processes THC through digestion rather than your lungs. After you eat a gummy, brownie, or capsule, effects usually begin between 30 minutes and 2 hours later. Peak intensity hits around 2 to 4 hours after that onset, and the full experience can last 6 to 10 hours.
The reason edibles last so much longer, and often feel stronger, comes down to what happens in your liver. When THC is digested, your liver converts it into a different compound that crosses into the brain more efficiently than THC itself. Preclinical research suggests this metabolite may be 2 to 7 times more psychoactive, though strong human data is still limited. This is why a 10mg edible can feel dramatically more powerful than the same amount of THC inhaled, and why the effects stick around for so much longer.
The slow, unpredictable onset is also why people sometimes take a second dose too early, thinking the first one “didn’t work.” If you’re new to edibles, give it at least 2 hours before considering more.
What Makes a High Last Longer or Shorter
Several factors push the duration in either direction:
- THC dose: Higher doses produce longer-lasting effects. A single hit from a low-potency strain fades faster than a full session with high-THC flower.
- Tolerance: Regular users develop significant tolerance to THC’s effects. Research shows that frequent users experience less pronounced subjective, cognitive, and behavioral effects from the same dose compared to occasional users. Cognitive effects show the highest degree of tolerance, sometimes to the point where a dose that would noticeably impair an infrequent user produces almost no measurable cognitive change in a daily user.
- Body composition: THC is fat-soluble, so it’s stored in fat tissue and released slowly. People with higher body fat percentages may experience a longer tail end of mild effects.
- Food intake: Eating a fatty meal before consuming cannabis can increase THC absorption, potentially intensifying and extending the high.
How CBD Changes the Experience
There’s a common belief that CBD counteracts or shortens a THC high, but recent research from the National Center for Complementary and Integrative Health found the opposite when both are taken orally. Participants who ingested high doses of THC combined with CBD experienced stronger drug effects, including more anxiety, sedation, and memory difficulty, plus worse cognitive and motor function compared to the same dose of THC alone.
The explanation: CBD appears to slow down the liver’s breakdown of THC and its active metabolites, keeping them in your system longer and at higher concentrations. So products marketed as “balanced” with both THC and CBD may actually produce a longer, more intense experience rather than a mellower one, at least when eaten rather than smoked.
The Aftereffects Can Outlast the High
Even after you stop feeling high, your brain hasn’t fully returned to baseline. Research from the University of Alberta found that cannabis impairs the ability to remember new verbal information, like retaining what you just read, for 12 to 24 hours after use. Within one to three days, that impairment drops by about half. Between three and seven days, test scores return to near normal.
This residual fog doesn’t feel like being high. Most people describe it as subtle sluggishness or difficulty concentrating. Memory tends to recover on a different timeline than motor skills or sensory processing, so you might feel physically fine while still struggling to retain new information.
Impairment Doesn’t Track with How High You Feel
One important finding that affects real-world decisions: how impaired you actually are doesn’t reliably match your THC blood levels or even how high you feel. A study conducted for the National Institute of Justice found that THC levels in blood, urine, and oral fluid did not correlate with measurable cognitive or motor impairment. Many participants showed significantly decreased functioning even when their THC levels were low.
This matters most for driving. The CDC notes that connecting THC concentration to driving impairment for any individual person is difficult, and their guidance is straightforward: if you plan to drive, the safest option is to avoid cannabis entirely. There is no well-established equivalent of the “wait two hours after your last drink” rule. The lingering cognitive effects described above, particularly the 12 to 24 hour window of impaired verbal learning, suggest that caution should extend well beyond the point where the high feels like it’s worn off.