A marijuana 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 on how you consume it, how much you take, your tolerance, and your body composition. Here’s what to expect for each method and what influences your personal timeline.
Smoking and Vaping
When you inhale cannabis, whether from a joint, pipe, or vape pen, effects begin within minutes. You’ll feel the peak intensity almost immediately, and the high generally lasts 1 to 3 hours. In some cases, lingering effects can stretch to 8 hours, especially with higher doses or if you’re newer to cannabis.
Concentrates (dabs, wax, shatter) hit even faster, producing effects within seconds. They peak around 15 to 30 minutes in, compared to 30 to 60 minutes for regular flower. Despite concentrates packing 60 to 90% THC versus 15 to 25% in flower, the overall duration is surprisingly similar for both: that same 1 to 3 hour window. The difference is mainly in intensity, not length. That said, a larger dose of a high-potency concentrate will push you toward the longer end of the range.
Edibles
Edibles follow a completely different timeline. They typically take 30 to 60 minutes to kick in because THC has to pass through your digestive system before reaching your bloodstream. Peak blood levels don’t arrive until about 3 hours after you eat them. This slow ramp-up is why people sometimes make the mistake of taking a second dose too early, thinking the first one didn’t work.
Once the effects arrive, they last much longer than inhaled cannabis. Expect 6 to 8 hours of noticeable effects, with some residual feeling potentially stretching beyond that. The extended duration happens because your liver converts THC into a more potent form that enters your bloodstream gradually rather than all at once.
How CBD Changes the Equation
If your edible or flower contains a significant amount of CBD alongside THC, the effects may be stronger and longer lasting, not milder. A Johns Hopkins study found that when participants ate a brownie containing both THC and CBD, the peak THC levels in their blood were nearly double compared to a brownie with the same 20mg dose of THC alone. CBD inhibits the breakdown of THC in the liver, essentially letting more of it circulate for longer.
Participants in that study also reported greater overall drug effects, more unpleasant side effects, more difficulty performing routine tasks, and a larger spike in heart rate. This runs counter to the popular belief that CBD “cancels out” THC. At high CBD doses in edible form, it can actually amplify it.
What Affects Your Personal Timeline
Five main factors shift how long you’ll feel the effects:
- Dose: This matters most. A single puff and a full joint are different experiences entirely. The more THC you consume, the longer your body needs to process it.
- Tolerance: Regular users metabolize THC more efficiently. Someone who uses daily will have a noticeably shorter, less intense experience than someone trying cannabis for the first time at the same dose.
- Body fat: THC is stored in fat cells. People with higher body fat may retain THC longer, potentially extending both the high and the lingering aftereffects.
- Metabolism: A faster metabolism breaks down THC more quickly. Age, activity level, and genetics all play into this.
- Mixing with alcohol: Cannabis and alcohol enhance each other’s effects. Using both together can intensify the high and extend impairment well beyond what either substance would cause alone.
How Long Impairment Lasts
The high fading doesn’t mean you’re unimpaired. Colorado’s Department of Transportation recommends waiting at least 6 hours after smoking cannabis containing less than 35mg of THC before driving or doing anything safety-sensitive. For edibles under 18mg of THC, the minimum wait is 8 hours. Higher doses require waiting even longer, and products from unregulated sources can cause intoxicating effects lasting more than 12 hours.
If you’ve been drinking as well, add significant extra time. The combination of cannabis and alcohol impairs coordination and reaction time more than either one on its own.
Residual and Next-Day Effects
Even after the high wears off, subtle cognitive effects can linger. Research published in Frontiers in Psychiatry found mild residual impairments in memory, processing speed, and executive function that persist beyond the intoxication window. For occasional users, these effects are typically gone within a day or two.
For regular or daily users, the picture is different. Cognitive effects can persist for days or weeks after stopping. The good news is that these deficits appear to fade over time. Studies show that after about 3 days of abstinence, measurable impairments start to diminish significantly. After 10 days to a month without use, most users no longer show meaningful cognitive deficits compared to non-users. The severity of residual effects scales with frequency: daily use is associated with mild to moderate deficits, while occasional use produces minimal lasting impact.
How Long THC Stays in Your Body
There’s an important distinction between how long you feel high and how long THC remains detectable. Active THC has a plasma half-life of about 1.5 hours in occasional users and 2 hours in chronic users, which tracks roughly with the duration of the high from smoking.
The inactive byproducts your body creates while breaking down THC stick around far longer. These metabolites have a half-life of about 5 days in occasional users and 6 days in frequent users. Terminal elimination (the tail end of the process) can take 3 to 4 days in occasional users and 12 days or more in frequent users. This is why drug tests can detect cannabis use long after you’ve stopped feeling any effects. THC stored in fat cells gets released slowly back into the bloodstream, keeping those metabolite levels detectable for weeks in heavy users.