How long you stay high depends entirely on what you consumed and how you consumed it. A cannabis high from smoking typically lasts 2 to 4 hours, while an edible can keep you high for 6 hours or more. Other substances follow their own timelines, from a 4-to-6-hour psilocybin trip to a 3-to-6-hour MDMA experience.
Smoking or Vaping Cannabis
When you inhale cannabis, whether by smoking or vaping, the effects hit fast and fade relatively quickly. You’ll feel something within minutes, peak somewhere in the first hour or two, and return to baseline after about 2 to 4 hours total. A National Institute of Justice study on vaporized THC found that cognitive and psychomotor effects peaked within the first two hours and returned to normal after four hours.
Vaping doesn’t necessarily make the high last longer than smoking, but it does make it stronger. A Johns Hopkins study found that infrequent users who vaped the same dose of THC experienced significantly more intense effects than those who smoked it. Participants in that study reported feeling the drug’s effects for five or six hours, even though THC was only detectable in their blood for four. So your personal experience may stretch a bit beyond what the averages suggest, especially if your tolerance is low or the product is potent.
Edibles: Slower Onset, Longer Duration
Edibles are a different animal. When you eat cannabis, your digestive system absorbs the THC and sends it to the liver before it reaches your brain. The liver converts a portion of the THC into a more potent psychoactive form, which is partly why edibles can feel stronger and last so much longer than smoking.
The tradeoff is speed. Peak THC levels from edibles don’t arrive until 60 to 120 minutes after you eat them, and the full effects can take more than six hours to fade. A National Institute of Justice study on oral THC found that cognitive effects appeared about one hour after dosing, peaked around five hours in, and didn’t return to baseline until eight hours after administration. That’s roughly double the duration of inhaled cannabis.
This slow, unpredictable onset is where most people run into trouble. You eat a gummy, feel nothing after 45 minutes, eat another one, and then both kick in at once. If you’re new to edibles, starting with 5 to 10 mg of THC and waiting at least two hours before considering more is a reliable way to avoid an uncomfortably long and intense experience.
Psilocybin Mushrooms
A typical mushroom trip lasts 4 to 6 hours from start to finish. You’ll notice the first effects within 20 to 40 minutes, though it can sometimes take over an hour. The peak arrives around 1.5 to 2 hours in and lasts for 1 to 3 hours, bringing the most intense visual and psychological effects. After that, you’ll gradually come down over the remaining hours. Mental clarity returns first, though some visual distortions may linger toward the tail end.
Dose plays a major role. A small dose on the lower end of the spectrum will produce a shorter, milder experience, while a larger dose extends both the peak and the overall timeline. Eating mushrooms on an empty stomach tends to speed up the onset but doesn’t dramatically change total duration.
MDMA
MDMA’s primary effects last roughly 3 to 6 hours. The onset takes 30 to 60 minutes, followed by a peak window of about 1.5 to 3 hours where the characteristic feelings of euphoria, emotional openness, and sensory enhancement are strongest. After that, the effects taper off and fatigue and mood changes set in.
What sets MDMA apart is the comedown that follows. Many people experience lingering after-effects for 1 to 3 days, including fatigue, irritability, low mood, and disrupted sleep. This is sometimes called “Tuesday Blues” because weekend use tends to catch up by midweek. The high itself is moderate in length, but the recovery period is notably longer than most other substances.
Alcohol
Alcohol doesn’t produce a “high” in the same sense, but its impairing effects follow a predictable timeline based on simple math. Your body clears alcohol at a rate of about .015 to .020 BAC per hour. If you drink enough to reach .08 BAC (the legal driving limit in most U.S. states), it takes roughly 4 to 5 hours to return to zero. More drinks means a higher starting BAC and a longer wait. Nothing speeds up this process: not coffee, not food, not a cold shower. Time is the only thing that works.
Why Mixing Substances Changes the Timeline
Combining cannabis and alcohol doesn’t just add the two effects together. Drinking before using cannabis increases THC absorption, resulting in a stronger high. A 2015 study found significantly higher peak THC levels in people who drank alcohol before vaping THC compared to those who had a placebo drink. Using cannabis before drinking can do the opposite, masking the effects of alcohol so you feel less intoxicated than you actually are. Either combination makes both the intensity and the practical duration harder to predict.
Feeling Sober vs. Actually Being Sober
One important distinction: the point where you stop feeling high is not the same as the point where your body has fully cleared the substance. The National Institute of Justice found that THC levels in blood, urine, and oral fluid did not reliably correlate with actual impairment. Some study participants showed significant cognitive and motor impairment even when their THC levels were low. Others had high THC levels with minimal impairment. This disconnect means you can feel mostly normal while your reaction time and judgment are still affected, or you can feel residual effects long after your body has metabolized most of the substance.
For cannabis specifically, Johns Hopkins researchers noted that participants reported feeling effects for five or six hours even though THC was undetectable in blood after four. The subjective experience of being high and the measurable presence of a substance in your body operate on different clocks.