A cannabis high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling effects for 6 to 8 hours. The exact duration depends on how you consume it, how much you use, and how your body processes THC. Here’s what to expect across different methods and what can push those timelines longer.
Smoking and Vaping: 1 to 3 Hours
When you smoke or vape cannabis, effects begin within minutes. The high peaks almost immediately after inhalation and then gradually tapers off. Most people feel back to baseline within 1 to 3 hours, though lingering effects like mild relaxation or slight fogginess can stretch up to 8 hours in some cases. This fast onset and relatively short window is why inhalation remains the most common method for people who want predictable timing.
Edibles: 6 to 8 Hours
Edibles follow a completely different timeline. They typically take 30 to 60 minutes to kick in, and peak intensity hits around 3 hours after you eat them. The total high generally lasts 6 to 8 hours, sometimes longer.
The reason edibles hit harder and last longer comes down to how your liver processes THC. When you swallow cannabis, your liver converts THC into a different compound that is up to 5 times more potent than the THC you inhaled. This is why the same amount of THC in an edible can feel dramatically stronger than in a joint, and why people who are new to edibles are especially prone to uncomfortable experiences. The common mistake is taking a second dose before the first one kicks in, then dealing with an unexpectedly intense high that lasts most of the day.
What Makes a High Last Longer or Shorter
Several factors shift the timeline in either direction.
Dose and potency are the most obvious variables. Higher THC concentrations produce a stronger and longer-lasting high. Today’s cannabis products are significantly more potent than what was available a couple of decades ago, which means even experienced users can be caught off guard by a new strain or product.
Genetics play a bigger role than most people realize. About one in four people carry a gene variant that causes their body to break down THC less efficiently. These slower metabolizers experience stronger and longer-lasting effects from the same dose. If you’ve ever wondered why your friend seems fine after a hit while you’re still high two hours later, this is a likely explanation.
Tolerance matters too. Regular users develop a tolerance that shortens and dulls the high over time. Their bodies become more efficient at processing THC and their brain receptors become less responsive to it. Conversely, if you haven’t used cannabis in a while, even a small amount can produce a surprisingly long experience.
Body composition and metabolism also factor in. THC is fat-soluble, meaning it gets stored in fat tissue and released slowly. People with higher body fat percentages may notice subtly prolonged effects, though this matters more for how long THC stays detectable on a drug test than for how long the high itself lasts.
Sublingual Products: Somewhere in Between
Tinctures and strips placed under the tongue absorb through the blood vessels in your mouth, bypassing the liver on the first pass. This gives them a faster onset than edibles (usually 15 to 30 minutes) with a duration that falls between smoking and eating. They’re often used in medical contexts when someone needs relief faster than an edible provides but longer-lasting than inhalation offers.
The Next-Day Hangover Effect
Even after the high wears off, you may not feel completely sharp the next day. Many users describe a “weed hangover” involving grogginess, mild brain fog, or slower reaction times. This residual impairment is subtle enough that you might not notice it unless you’re doing something mentally demanding.
Research backs this up. Studies have found that memory and learning problems from heavy cannabis use can linger for a week or longer after stopping. One study at Johns Hopkins evaluated heavy users after 28 days of abstinence and found they still scored lower on tests of memory, executive functioning, psychomotor speed, and manual dexterity. The heaviest users in the study were smoking 78 to 117 joints per week, so these findings reflect extreme use. For occasional users, next-day effects are typically mild and clear within 24 hours.
How Long THC Stays in Your System
Feeling sober and testing clean are two very different timelines. The high may last a few hours, but THC metabolites linger in your body far longer because they’re stored in fat cells and released gradually. A single use can show up on a urine test for 3 to 5 days. Regular users can test positive for 30 days or more after their last use, and very heavy, long-term users sometimes test positive for 60 to 90 days. Blood and saliva tests have shorter detection windows, typically 24 to 72 hours, while hair tests can detect use for up to 90 days regardless of frequency.
This gap between feeling normal and being technically “clean” is worth keeping in mind if you face workplace drug testing, legal requirements, or situations where impairment matters, like driving. Even when you feel fine, trace amounts of THC can still be measurable in your body for weeks.