How long a high lasts depends entirely on the substance, the method of consumption, and your body. A smoked cannabis high typically lasts 1 to 3 hours, while an edible high can stretch to 12 hours. Stimulants, psychedelics, and other substances each follow their own timeline. Here’s a practical breakdown of what to expect.
Cannabis: Smoking and Vaping
When you smoke or vape cannabis, effects begin within minutes and peak almost immediately. The core high typically lasts 1 to 3 hours, though lingering effects can stick around for up to 8 hours depending on the potency of the product and how much you consumed. Most people feel functionally normal again within 3 to 4 hours of a moderate session.
The quick onset happens because THC passes directly from your lungs into your bloodstream and reaches the brain within seconds. Effects plateau around 15 to 30 minutes after the first inhale and begin tapering off within 2 to 3 hours.
Cannabis: Edibles
Edibles follow a completely different timeline. Effects take 30 to 90 minutes to begin because the THC has to travel through your digestive system and get processed by your liver before it enters your bloodstream. The high peaks around 2 to 3 hours after eating and lasts anywhere from 4 to 12 hours total.
This delay is the main reason people accidentally take too much. They eat a dose, feel nothing for an hour, take more, and then both doses hit at once. The intensity and duration depend heavily on whether you ate on a full or empty stomach, your metabolism, and your tolerance. If you’re new to edibles, the standard advice is to start with a low dose and wait at least two hours before considering more.
Alcohol
Alcohol’s timeline is tied to a simple math problem. Your body clears roughly 0.015 to 0.020 blood alcohol concentration (BAC) per hour. That means if you drink enough to reach the legal limit of 0.08 BAC, it takes about 4 to 5 hours to fully sober up. The “buzzed” feeling from a couple of drinks fades in 1 to 2 hours, but heavier drinking extends impairment well into the next morning.
Your liver does nearly all the work here, and it processes alcohol at a fixed rate regardless of how much coffee you drink or cold air you breathe. Nothing speeds it up.
MDMA (Ecstasy)
The primary effects of MDMA last about 3 to 6 hours depending on the dose. Most people feel the onset within 30 to 45 minutes, with the peak rolling sensation arriving around 1 to 2 hours in. After the main effects wear off, a comedown period can bring fatigue, low mood, or irritability.
This comedown isn’t just psychological. MDMA floods the brain with serotonin (the chemical that regulates mood, sleep, and emotional stability), and it takes roughly 14 days for depleted serotonin levels to return to normal. The heaviest part of the comedown usually hits a day or two after use, sometimes called “Suicide Tuesday” among weekend users.
LSD (Acid)
LSD is one of the longest-lasting psychoactive substances. Effects begin 20 to 90 minutes after taking a tab, and the full trip lasts 6 to 12 hours for most people, with some experiences stretching to 15 hours. The drug works by locking onto serotonin receptors in the brain and essentially staying attached. The trip doesn’t fade until those molecules come loose, which is why it takes so long.
After the main trip ends, many people experience an “afterglow” period lasting another six hours or so. This can include feelings of lightness, mild anxiety, or a shift in perspective. Between the trip itself and the comedown, it can take up to 24 hours for your body to feel fully back to baseline.
Cocaine
Cocaine produces one of the shortest highs of any common substance. When snorted, effects begin within a few minutes and the high lasts roughly 15 to 30 minutes. Smoking cocaine (as crack) produces an even faster, more intense rush, but the high is even shorter, often fading within 5 to 10 minutes. This short duration is a major factor in repeated dosing, which significantly increases cardiovascular risk.
Methamphetamine
Methamphetamine sits at the opposite end of the stimulant spectrum. The high can last 8 to 12 hours or longer, driven by the drug’s long half-life of 6 to 15 hours. (A half-life is the time it takes for your body to eliminate half the substance from your bloodstream.) Because the drug clears so slowly, residual stimulation and sleep disruption can persist for 24 hours or more after a single dose.
Why Duration Varies From Person to Person
Two people can take the same substance at the same dose and have noticeably different experiences. Several biological factors explain why.
Body composition: For fat-soluble substances like THC and many sedatives, higher body fat can mean the drug gets stored in fatty tissue and released slowly over a longer period. This can extend both the high and the detection window. However, this isn’t a universal rule. Research from the European Medicines Agency notes that even among fat-soluble drugs, the relationship between body weight and drug distribution varies widely, suggesting other individual factors play a role too.
Liver function: Your liver is the primary processing plant for most substances. People with fatty liver (which affects roughly 90% of people with obesity) may metabolize certain drugs more slowly due to reduced enzyme activity, potentially extending a high. Conversely, some liver enzymes actually work faster in people with higher body weight, meaning certain substances clear more quickly.
Tolerance: Regular use of nearly any substance causes your brain to adapt, meaning the subjective high feels shorter and less intense even when the drug is still active in your system. This is especially relevant for cannabis, opioids, and alcohol, where tolerance builds relatively quickly.
Method of consumption: Across all substances, faster routes of administration (smoking, injecting) produce quicker, more intense, and shorter highs. Slower routes (eating, swallowing) produce delayed, milder, and longer-lasting effects. This pattern holds consistently for cannabis, stimulants, and opioids alike.
Quick Reference by Substance
- Cannabis (smoked/vaped): 1 to 3 hours, up to 8 hours with lingering effects
- Cannabis (edibles): 4 to 12 hours
- Alcohol: 1 to 5+ hours depending on amount consumed
- MDMA: 3 to 6 hours, with a multi-day comedown
- LSD: 6 to 12 hours, up to 24 hours to feel fully normal
- Cocaine (snorted): 15 to 30 minutes
- Methamphetamine: 8 to 12+ hours