How long a high lasts depends entirely on what substance you’re dealing with. A cannabis high from smoking typically lasts 1 to 3 hours, while an edible can keep you feeling altered for 6 to 7 hours. Alcohol, stimulants, and psychedelics each follow their own timelines, and biological factors like body fat and tolerance shift those windows further.
Cannabis: Smoked or Vaped
When you smoke or vape cannabis, effects begin within minutes. The high peaks almost immediately after inhalation and typically lasts 1 to 3 hours, though lingering effects can stretch to 8 hours in some cases. The wide range comes down to potency, how much you consumed, and your individual tolerance. A single hit from a low-THC strain will fade much faster than multiple pulls from a high-potency concentrate.
Most people feel functionally normal within 3 to 4 hours of smoking, even if subtle effects like mild relaxation or slight mental fog persist a bit longer.
Cannabis: Edibles
Edibles are a completely different experience. Because THC has to pass through your digestive system and liver before reaching your brain, onset takes roughly 1 to 2 hours, sometimes longer on a full stomach. This delay is why people often make the mistake of eating more before the first dose kicks in.
Research on cannabis edibles shows measurable impairment in driving speed about 2 hours after consumption, with subjective intoxication lasting around 7 hours. Participants in that study reported feeling less willing or able to drive for up to 6 hours. If you’ve eaten an edible and are wondering when you’ll feel normal again, plan for at least 6 hours from when the effects first hit, not from when you ate it.
Alcohol
Alcohol follows a predictable, linear path. Your liver clears it at a fixed rate of about 0.015% blood alcohol concentration per hour, regardless of your gender, size, or body type. That means a person at 0.08% BAC (the legal driving limit in most U.S. states) will need roughly 5 to 6 hours to fully sober up.
The “high” from alcohol, that warm, loosened-up feeling, fades as your BAC drops. But impairment lingers longer than the pleasant effects do. You can feel mostly sober while still being measurably impaired. Coffee, cold showers, and exercise do nothing to speed up this process. Only time works.
Stimulants
Cocaine produces an intense but short-lived high. Snorted powder cocaine typically lasts 15 to 30 minutes, while crack cocaine (the smokeable form) peaks faster and fades within about 5 to 10 minutes, which drives repeated use in a short window.
Methamphetamine is a different story entirely. Its effects can last up to 12 hours depending on the method of use, making it one of the longest-acting stimulants. The extended duration also means a longer and more difficult comedown, with fatigue, irritability, and depression sometimes lasting days.
Psychedelics
Psilocybin mushrooms and LSD both take about an hour to kick in on an empty stomach, but their total durations differ significantly. A mushroom trip typically wraps up within 6 hours. An LSD trip can continue for a full 10 hours, and some residual alertness or mental stimulation may persist beyond that.
MDMA falls somewhere in between, with primary effects lasting 3 to 6 hours. Peak intensity hits between 1.5 and 3 hours after ingestion. What makes MDMA distinct is its comedown: the aftereffects, including low mood, fatigue, and irritability, commonly last 1 to 3 days as your brain replenishes the feel-good chemicals that were depleted during the high.
Why Duration Varies From Person to Person
Two people can take the same substance at the same dose and have noticeably different experiences. Body fat is one of the biggest variables. Fat-soluble substances (cannabis being the prime example) dissolve into fatty tissue and get released slowly over time. People with higher body fat percentages tend to experience longer-lasting effects because the substance lingers in their system rather than being cleared quickly. This also means effects can persist after you’d expect them to be gone, as the substance continues leaking out of fat stores.
Tolerance matters too. Regular users of almost any substance metabolize it more efficiently, shortening the perceived high. First-time or infrequent cannabis users, for instance, often report effects lasting significantly longer than experienced users consuming the same amount. Hydration, food intake, sleep, and liver health all play supporting roles.
What Won’t Speed Things Up
The internet is full of supposed tricks to sober up faster, and almost none of them work. Coffee makes you a more alert version of impaired, not a less impaired one. Cold showers may jolt you awake but have zero effect on how fast your body processes a substance. Exercise doesn’t accelerate metabolism of alcohol or THC in any meaningful way.
One popular claim is that CBD can counteract a THC high. Research from the National Center for Complementary and Integrative Health actually found the opposite: when participants consumed CBD alongside THC in edible form, they experienced stronger drug effects, including more anxiety, greater sedation, and worse cognitive performance than when they took the same dose of THC alone. The reason is that CBD interferes with how your liver breaks down THC, effectively slowing its clearance and prolonging your exposure to it.
The only reliable way to come down is to wait it out. Staying hydrated, eating something, and resting in a comfortable environment can make the wait more tolerable, but they won’t shorten it.
Feeling High vs. Testing Positive
It’s worth knowing that the high wearing off does not mean the substance has left your body. Drug tests detect metabolites, the leftover byproducts your body creates while processing a substance, and these stick around far longer than any noticeable effects. Cannabis is the most extreme example: a single use can show up on a urine test for 3 to 10 days, and heavy, daily use can remain detectable for 30 days or more. Cocaine metabolites are typically detectable for 2 to 4 days, while alcohol clears urine within 12 to 24 hours. If you’re concerned about testing, the relevant window is metabolite detection, not how long you felt the effects.