A cannabis high from smoking or vaping typically lasts 1 to 3 hours, with effects peaking around 30 minutes after your first inhale. Edibles last significantly longer, often 6 to 8 hours. The exact duration depends on how you consume it, how much you use, your tolerance level, and even your genetics.
Smoking and Vaping: 1 to 3 Hours
When you smoke or vape cannabis, THC enters your bloodstream through your lungs and reaches your brain within seconds. Blood levels of THC peak about 10 to 15 minutes after that first puff, and the full subjective high peaks within 30 minutes. Most people feel noticeably high for 1 to 3 hours, though some residual effects like mild relaxation or slight fogginess can linger for up to 6 hours.
This fast onset is why smoking remains the easiest method to control your dose. You feel results almost immediately, so you can stop when you’ve reached the intensity you want. Vaping follows roughly the same timeline as smoking, since both deliver THC through your lungs.
Edibles: 6 to 8 Hours
Edibles take 30 to 60 minutes to kick in, and peak blood levels of THC don’t arrive until about three hours after you eat them. That slow ramp-up is why people sometimes make the mistake of eating more before the first dose has fully hit. The total high from an edible generally lasts 6 to 8 hours, making it roughly two to three times longer than smoking the same amount of THC.
The reason for this difference is digestion. When you eat THC, your liver converts it into a metabolite that crosses into the brain more effectively and sticks around longer than inhaled THC. This also tends to produce a more intense body-centered high. If you’re new to edibles, starting with 5 mg of THC or less and waiting at least two hours before considering more is a common approach.
Tinctures: Somewhere in Between
Sublingual tinctures, the drops you hold under your tongue, fall between smoking and edibles. Effects can last anywhere from 1 to 6 hours depending on dosage. Holding the tincture under your tongue allows some THC to absorb directly into your bloodstream through the thin tissue there, giving a faster onset than edibles. Whatever you swallow gets processed through your liver like an edible, which is why the duration range is so wide.
Concentrates and Dabs
Dabbing or vaping concentrates delivers a much higher dose of THC per hit than flower, often 60 to 90 percent THC compared to 15 to 30 percent in typical flower. The onset is just as fast as regular smoking since the delivery route is the same (lungs to blood to brain), but the higher dose means the peak is more intense and the high can last longer, often 3 hours or more. For someone with low tolerance, a single dab can produce effects that feel overwhelming for several hours.
Why the Same Product Hits People Differently
Your individual biology plays a surprisingly large role. About one in four people carry a genetic variation that causes their liver enzymes to break down THC less efficiently. For these people, the same dose produces a stronger and longer-lasting high. This is one reason two friends can share the same joint and have noticeably different experiences.
Tolerance is the other major factor. Regular users develop tolerance to THC relatively quickly, which shortens the perceived duration and blunts the intensity. Someone who smokes daily might feel high for an hour from a joint that keeps an occasional user buzzed for three.
CBD content also matters, but not in the way many people assume. A study from Johns Hopkins found that high doses of CBD in edible products actually inhibit the breakdown of THC, making effects stronger and longer-lasting rather than mellowing them out. This interaction was observed with a 640 mg dose of CBD, which is far higher than what most products contain, but it challenges the popular idea that CBD always counteracts THC.
The After-Effects Last Longer Than the High
Even after you stop feeling high, cannabis continues to affect your brain. Research from the University of Alberta found that the ability to remember new verbal information, like retaining what you just read, stays impaired for 12 to 24 hours after use. Within one to three days that impairment drops by half, and by three to seven days, cognitive test scores return to near normal.
This matters most for anything requiring sharp focus. You might feel completely sober the morning after using cannabis, but subtle effects on memory, reaction time, and motor coordination can persist. The timeline varies by person: memory tends to recover faster than fine motor skills in some individuals.
How Long Before You’re Safe to Drive
There’s no breathalyzer-style threshold for cannabis, which makes this question harder to answer than with alcohol. The largest driving study on this topic, conducted at UC San Diego with 191 cannabis users, found that frequent users showed no measurable driving impairment after at least 48 hours of abstinence. For occasional users or after higher doses, the safe window is likely longer.
A conservative recommendation from researchers at the University of Alberta puts the safe-to-drive window at around 72 hours, though they acknowledge it could be somewhat less for many people. At minimum, waiting well past the point where you feel “back to normal” is important, since subtle impairment outlasts the subjective high by many hours.