A cannabis high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling effects for 6 to 8 hours. The actual duration depends heavily on how you consume it, how much you use, and your individual tolerance. Here’s what to expect for each method and what happens after the high fades.
Smoking and Vaping: 1 to 3 Hours
When you smoke or vape cannabis, effects begin within minutes. THC passes directly from your lungs into your bloodstream, reaching your brain almost immediately. The high peaks right after you inhale and then gradually tapers off over the next one to three hours. In some cases, lingering effects can stretch up to eight hours, especially with higher-potency products or if you’re newer to cannabis.
This fast onset is part of why smoking and vaping feel easier to control. You feel the effects quickly, so you can gauge how high you are before deciding whether to take another hit. The tradeoff is that the peak is intense but relatively short-lived.
Edibles: 6 to 8 Hours
Edibles follow a completely different timeline. They typically take 30 to 60 minutes to kick in, and THC levels in the blood don’t peak until about three hours after you eat them. The total high generally lasts 6 to 8 hours, sometimes longer with high doses.
The reason edibles hit harder and last longer comes down to how your body processes THC. When you eat cannabis, THC passes through your digestive system and into your liver before reaching your brain. Your liver converts THC into a different active compound that is more potent and longer-lasting than the THC you inhale. This “first-pass metabolism” also produces significantly higher levels of that compound compared to smoking, which is why edible highs feel distinctly more intense and full-bodied for many people.
The delayed onset catches a lot of people off guard. A common mistake is eating more because you don’t feel anything after 30 minutes, only to have the original dose hit you an hour later alongside the second one. If you’re trying edibles, starting with a low dose (5 mg of THC or less) and waiting at least two hours before taking more gives your body time to process what you’ve already consumed.
Factors That Change the Timeline
These time ranges are averages, and your experience can shift noticeably based on several factors:
- Dose and potency: Higher-THC products produce a more intense and longer-lasting high. A single puff of a 15% flower hits differently than a dab of 80% concentrate.
- Tolerance: Regular users metabolize THC more efficiently and often report shorter, less intense highs from the same dose that would floor a beginner.
- Body composition: THC is fat-soluble, meaning it gets stored in fatty tissue. People with higher body fat percentages may process THC differently, and stored THC can release slowly over time.
- Whether you’ve eaten: Consuming cannabis on an empty stomach (especially edibles) can speed up absorption and intensify effects. A full stomach slows things down but can also extend the duration.
The “Weed Hangover” the Next Day
Some people feel off the day after using cannabis, particularly after higher doses or edibles. Commonly reported symptoms include fatigue, brain fog, dry mouth, dry eyes, headaches, and mild nausea. A 2019 study found that smoking cannabis could lead to daytime fatigue the following day, and an older study from 2011 linked cannabis use to next-day irritability and generally feeling miserable.
Not everyone experiences this, and there’s no set duration for how long it lasts. The strength of what you used, the method of consumption, and your personal tolerance all play a role. With very high doses, residual THC can remain in your blood at levels high enough the next morning that you may still feel somewhat high rather than hungover. If you do feel foggy the next day, hydration, food, and sleep tend to resolve it within a few hours.
When You’re Actually Impaired vs. When You Feel Fine
One of the trickier aspects of cannabis is that how you feel doesn’t always match how impaired you actually are. Research from the National Institute of Justice found that THC levels in blood, urine, and saliva did not reliably correlate with cognitive or motor impairment. Many study participants showed significantly decreased functioning even when their THC levels tested low. In other words, you can feel relatively sober while your reaction time and judgment are still compromised.
This matters most for driving. The CDC notes that it’s difficult to connect THC concentration to impairment for any individual person, and their guidance is straightforward: if you plan to drive, the safest choice is to avoid cannabis entirely beforehand. There’s no reliable “wait X hours and you’re good” rule the way there roughly is with alcohol, because impairment varies too much between people and methods of consumption. As a general practice, waiting well beyond the point where you feel the high has worn off gives you the best margin of safety, especially with edibles where residual effects can linger for many hours after the peak subsides.