A cannabis high from smoking or vaping typically lasts 1 to 3 hours, with effects potentially lingering up to 6 hours. Edibles last significantly longer, often 6 to 8 hours and sometimes up to 12. The exact duration depends on how much you consume, how you consume it, and your individual biology.
Smoked or Vaped Cannabis
When you smoke or vape, THC enters your bloodstream through your lungs and reaches your brain within seconds to a few minutes. The high peaks around 30 minutes after your first inhale, then gradually tapers off. Most people feel noticeably high for 1 to 3 hours, but measurable effects on coordination and reaction time can persist for up to 6 hours. Some residual effects, like feeling slightly foggy or sluggish, can linger up to 24 hours.
A meta-analysis of driving impairment studies found that most cognitive and motor skills recover within about 5 hours of inhaling 20 mg of THC, and nearly all skills recover within 7 hours. That 20 mg figure is a moderate-to-high dose, roughly equivalent to smoking a full joint of average-potency flower. Lower doses wear off faster.
Edibles and Drinks
Edibles take longer to kick in and last much longer. You’ll start feeling effects anywhere from 30 minutes to 2 hours after eating or drinking cannabis, with the high peaking around 4 hours in. The full experience typically runs 6 to 8 hours, though effects can stretch to 12 hours with higher doses. Residual effects, just like with smoking, can carry into the next day.
The reason edibles hit harder and last longer comes down to how your liver processes THC. When you eat cannabis, THC passes through your digestive system and into the liver before reaching your brain. The liver converts a large portion of it into a more potent compound that crosses into the brain more easily and binds more strongly to the same receptors THC targets. When you smoke, most THC goes straight to your brain without that conversion step, so you get less of this stronger metabolite. This is why a 10 mg edible can feel far more intense than smoking the same amount of THC.
The slow, unpredictable absorption from your gut is also why edibles catch people off guard. If you eat more because you “don’t feel anything” after 45 minutes, both doses can hit simultaneously hours later, creating an uncomfortably intense and prolonged high.
Tinctures and Sublingual Products
Cannabis tinctures held under the tongue offer a middle ground. THC absorbs through the thin tissue under your tongue directly into your bloodstream, partially bypassing the liver. The result is a faster onset than edibles and a shorter overall experience, typically around 1 to 2 hours. If you swallow a tincture instead of holding it under your tongue, it behaves more like an edible, with a slower onset and longer duration.
What Makes Your High Last Longer or Shorter
Two people can take the same dose and have very different experiences. Several factors explain why.
Dose and potency are the most obvious variables. Higher THC concentrations and larger amounts produce longer-lasting effects. A single hit from a low-potency joint wears off faster than multiple hits from a high-potency concentrate. With edibles, the difference between 5 mg and 25 mg isn’t just intensity; it’s hours of additional duration.
Body fat percentage matters because THC is fat-soluble. It binds to fat molecules and gets stored in fatty tissue, then releases slowly over time. Someone with a higher body fat percentage has more storage capacity for THC, which can extend how long the compound circulates. Two people consuming identical doses may process them at noticeably different rates for this reason alone.
Metabolism and genetics also play a role. Your liver breaks down THC using a specific enzyme system, and genetic variations mean some people are naturally fast metabolizers while others are slow. Age factors in too: metabolic processes tend to slow down as you get older, potentially stretching the timeline. Overall liver and kidney health affect how efficiently your body clears cannabinoids.
Tolerance is a major factor that research numbers don’t always capture. Regular users develop tolerance to THC’s effects, meaning the subjective high may feel shorter even though THC is still active in the body. A first-time user can feel intensely high from a dose that a daily user barely notices.
The Next-Day “Hangover”
Some people report feeling groggy, slightly off, or mentally slow the morning after using cannabis. Research paints a nuanced picture. One study of frequent cannabis users found no measurable cognitive impairment the next morning compared to a matched control group. However, the cannabis group still reported subjectively feeling some drug effects the morning after.
Potency mattered. Within the cannabis group, those who had smoked higher-THC products showed poorer verbal memory recall the next day, and higher blood levels of THC metabolites correlated with slower processing speed. So while a moderate session may leave you feeling fine the next morning, heavy use of high-potency products carries a greater chance of next-day mental fogginess, particularly around memory and reaction time.
How Long to Wait Before Driving
Colorado’s Department of Transportation offers some of the most specific public guidance available. Their recommendations: wait at least 6 hours after smoking cannabis containing less than 35 mg of THC before driving. For edibles with less than 18 mg of THC, wait at least 8 hours. Higher doses require waiting longer.
If you’ve also been drinking alcohol, you need to wait even longer than these baselines. Cannabis and alcohol amplify each other’s impairing effects. Unregulated products from illegal markets can also produce unpredictable highs lasting beyond 12 hours.
It’s worth noting that no medical or regulatory body has established a universal blood-THC threshold that defines “impaired” the way 0.08% blood alcohol does for drinking. The American College of Occupational and Environmental Medicine has stated that defining a clear impairment window isn’t currently possible given the variability in products, doses, and individual absorption rates. The practical takeaway: err on the side of waiting longer than you think you need to, especially with edibles.