A cannabis high from smoking or vaping typically lasts 2 to 3 hours, while edibles can keep you high for 6 to 8 hours. The exact duration depends on how you consume it, how much you take, your tolerance, and your body composition. Other substances have their own timelines, which vary just as widely.
Smoked or Vaped Cannabis
When you inhale cannabis smoke or vapor, THC enters your bloodstream within seconds. You’ll feel the peak intensity about 6 to 10 minutes after your first puff, and the main psychoactive effects wind down over the next 2 to 3 hours as your body metabolizes the active compounds. This makes inhalation the fastest route in and the fastest route out.
The relatively short window is why some people smoke again partway through an evening. Each new session essentially resets the clock, though repeated dosing can make the overall experience feel muddier and the comedown heavier.
Edibles Take Longer to Hit and Last Much Longer
Edibles follow a completely different timeline. After you swallow a THC-infused gummy, brownie, or drink, the active ingredients pass through your digestive system and get processed by your liver before reaching your brain. That extra step means you typically won’t feel anything for 30 to 60 minutes, and peak blood levels don’t arrive until about three hours after you eat.
The total high from an edible generally lasts 6 to 8 hours. Because the onset is so slow, people sometimes make the mistake of eating a second dose before the first one kicks in, which can lead to an uncomfortably intense experience. If you’re new to edibles, the standard advice is to start with a low dose (5 to 10 mg of THC) and wait at least two hours before considering more.
Why the Same Person Can Have Different Experiences
Several factors shift the duration and intensity of any high:
- Tolerance. With repeated use, your body adapts. Liver enzymes that break down the substance become more active, and the receptors in your brain that respond to it become less sensitive. A daily user will often feel a shorter, less intense high from the same dose that floors a first-timer.
- Body fat. THC is fat-soluble, meaning it gets stored in your fat tissue and released slowly over time. People with higher body fat percentages may notice lingering effects or a longer tail on their high. Animal research published in the British Journal of Pharmacology found that stress and fasting can trigger fat cells to release stored THC back into the bloodstream, potentially producing mild re-exposure effects in heavy, chronic users.
- Dose and potency. This one is straightforward: more THC means a longer, stronger experience. A single hit of flower with 15% THC is a different animal than multiple hits of a concentrate at 80% or higher.
- Metabolism and genetics. People metabolize substances at different rates. A faster metabolism clears THC sooner, shortening the high.
The Day-After Comedown
Some cannabis users report hangover-like symptoms the morning after, especially following higher doses or edibles. Common complaints include fatigue, brain fog, dry mouth, dry eyes, headaches, and mild nausea. There’s no fixed timeline for how long these linger. Some people feel completely fine; others feel sluggish for several hours. The strength of the dose, the form of cannabis, and individual tolerance all play a role.
How Long Before You Can Drive
Colorado’s state guidelines, based on research findings, recommend waiting at least six hours after smoking up to 35 mg of THC before driving or biking. For edibles, the recommendation is at least eight hours after consuming up to 18 mg of THC, with longer waits for higher doses. In Colorado, drivers who test at or above 5 nanograms of THC per milliliter of blood can be found legally impaired. Impairment can outlast the subjective feeling of being high, so the safest approach is to build in extra time or arrange another way to get around.
How Other Substances Compare
Alcohol
Your liver processes roughly one standard drink per hour. A person who has four drinks will need about four hours to fully metabolize the alcohol, though impairment in balance, vision, and judgment starts at relatively low blood alcohol levels (around 0.04 to 0.06%) and gets significantly worse above 0.10%. Time is the only thing that actually removes alcohol from your system. Coffee, cold showers, and food do not speed up the process.
Psilocybin Mushrooms
Effects from magic mushrooms begin 30 to 60 minutes after eating them, peak around 90 to 120 minutes, and last a total of 4 to 6 hours depending on the dose. The comedown is usually gradual, and some people describe a lingering emotional “afterglow” for the rest of the day.
Cocaine
Cocaine produces a short, intense high. Depending on the route, the euphoric phase can be over in 15 to 30 minutes, which is one reason people tend to redose frequently.
Methamphetamine
The stimulant effects of methamphetamine can last up to 12 hours depending on how it’s used. That extended duration is one of the key differences between methamphetamine and cocaine, even though both produce a similar type of speedy euphoria.
Caffeine
Caffeine kicks in about 30 minutes after you drink it (the range is 15 to 45 minutes) and has a half-life of 5 to 6 hours. That means if you drink a cup of coffee at noon, roughly half the caffeine is still circulating at 5 or 6 PM. This is why afternoon coffee can disrupt sleep even if you feel fine by evening.