For cannabis, the most commonly searched substance, a high from smoking or vaping typically lasts 1 to 3 hours, with effects that can linger up to 6 hours. Edibles are a different story entirely, potentially lasting up to 12 hours. The actual duration depends on the substance, how it enters your body, your metabolism, and how often you use it.
Cannabis: Smoking vs. Edibles
When you smoke or vape cannabis, THC hits your bloodstream within minutes. Effects peak within about 30 minutes, and the core high usually fades within 1 to 3 hours. That said, residual effects like mild fogginess or relaxation can persist for up to 6 hours total. THC blood concentrations drop rapidly, falling significantly within 3 to 4 hours of inhalation.
Edibles follow a completely different timeline. Because THC has to pass through your digestive system and liver before reaching your brain, the onset is much slower. You might not feel anything for 30 minutes to 2 hours, and full effects can take up to 4 hours to peak. The total experience can last up to 12 hours. This delayed onset is why people sometimes make the mistake of eating more before the first dose kicks in, leading to an unexpectedly intense experience.
One important distinction: THC itself leaves your blood relatively quickly, but it’s stored in fat tissue for much longer. The half-life of THC in the body is about 1.3 days for infrequent users and 5 to 13 days for regular users. This means you can test positive on a drug test long after the high has worn off, but you won’t feel intoxicated during that time.
Alcohol
Alcohol’s effects depend heavily on how much and how fast you drink. A single standard drink is typically cleared from your system in about 1 to 3 hours, depending on the type: roughly 1 hour for a shot of liquor, 2 hours for a pint of beer, and 3 hours for a large glass of wine. Your body eliminates alcohol at a fairly fixed rate, so drinking faster than your liver can process it is what leads to escalating intoxication. There’s no way to speed this up. Coffee, water, and cold showers don’t change the timeline.
Stimulants
Cocaine produces a short, intense high. When snorted, the effects typically last 15 to 30 minutes, which is one reason people tend to redose frequently. Smoking crack cocaine produces an even shorter high, often just 5 to 10 minutes.
Methamphetamine is on the opposite end of the spectrum. Its effects can last up to 12 hours depending on how it’s used. This dramatically longer duration compared to cocaine is one of its defining characteristics and a major factor in the physical toll it takes, since the body stays in a heightened state for so long without rest or food.
MDMA (Ecstasy)
The primary effects of MDMA last 4 to 6 hours, depending on the dose and potency. The peak usually hits within 1 to 2 hours of taking it. What makes MDMA different from many other substances is the comedown that follows. After the main effects wear off, many people experience hours or even days of fatigue, low mood, and irritability as the brain replenishes the chemicals that were released in a surge during the high.
Opioids
Opioid highs vary widely depending on the specific substance. With fentanyl, a rapid rush of euphoria is followed by a period of calm lasting only 1 to 2 hours. Heroin follows a similar pattern, with the initial rush lasting a few minutes and the overall sedated state lasting 3 to 5 hours. Prescription opioid painkillers, depending on whether they’re short-acting or extended-release formulations, can produce effects lasting anywhere from 4 to 12 hours.
Hallucinogens
Psilocybin mushrooms typically produce a trip lasting 4 to 6 hours, with the peak occurring around 2 to 3 hours after ingestion. LSD lasts significantly longer. A single dose can produce effects for 8 to 12 hours, sometimes longer. Research comparing the two has confirmed that LSD’s effects consistently outlast psilocybin’s at comparable doses. Both substances can leave a lingering sense of altered perception or emotional openness for hours after the primary effects subside.
Why Duration Varies From Person to Person
The same dose of the same substance can produce a noticeably different experience in two people. Several biological factors explain this.
Your liver does most of the work breaking down psychoactive substances. The enzymes responsible for this vary from person to person based on genetics. Some people are naturally fast metabolizers who process substances quickly, shortening the high. Others are slow metabolizers who experience effects for longer at the same dose. Liver health matters too. In older adults, the liver’s processing capacity drops by 30% or more due to reduced blood flow and liver volume, which means substances stay active longer. People with chronic liver conditions experience a similar effect.
Body composition plays a role as well. Fat-soluble substances like THC are absorbed into fat tissue, which can extend how long trace amounts remain in your body. People with higher body fat percentages may retain these substances longer, though this affects drug test windows more than it affects the perceived high.
How Tolerance Changes the Experience
Regular use of nearly any psychoactive substance leads to tolerance, meaning your body adapts and the same dose produces weaker, shorter effects over time. This happens through two mechanisms: your liver gets more efficient at breaking down the substance, and the receptors in your brain become less responsive to it. The result is that experienced users often report shorter or less intense highs compared to when they first started using.
This is particularly well documented with opioids and alcohol, where long-term users need progressively larger doses to achieve the same effect. The gap between a dose that produces a high and a dose that causes serious harm narrows as tolerance builds, which is a core reason why escalating use carries increasing risk.
How the Route of Use Changes Duration
How a substance enters your body is one of the biggest factors determining how quickly it hits and how long it lasts. As a general rule, faster onset means shorter duration. Injecting a substance delivers it to the bloodstream immediately, producing rapid, intense effects that wear off sooner. Smoking or vaping is nearly as fast. Snorting is slightly slower. Oral ingestion is the slowest route, but effects tend to last the longest because the substance is absorbed gradually through the digestive system.
This is exactly why cannabis edibles last so much longer than smoked cannabis, and why the same principle applies across virtually every substance. The body processes drugs differently depending on how they arrive, and the liver’s “first pass” metabolism of orally ingested substances can also transform them into different active compounds that have their own duration profiles.