A THC high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling effects for 6 to 12 hours. The exact duration depends on how you consume it, how much you take, how often you use cannabis, and your individual body chemistry. Here’s what to expect for each method.
Smoking and Vaping
When you inhale cannabis, whether through a joint, pipe, bong, or vaporizer, effects hit within seconds to minutes. THC enters your bloodstream almost immediately through your lungs, and blood levels peak roughly 10 to 40 minutes after your session. This fast absorption is why smoking feels so immediate compared to other methods.
The main high typically tapers off after 1 to 3 hours, though some residual effects (mild relaxation, slightly slowed thinking) can linger beyond that window. At higher doses, noticeable effects can stretch longer. Colorado’s state guidelines recommend waiting at least six hours before driving after smoking less than 35 mg of THC, and longer for higher amounts.
Edibles
Edibles follow a completely different timeline. When you eat or drink THC, it passes through your digestive system and gets processed by your liver before reaching your brain. This detour is why onset takes 30 minutes to 2 hours, and why you might not feel the full intensity until about 4 hours after eating.
The high itself generally lasts 6 to 8 hours, though stronger doses can push intoxicating effects out to 12 hours. Some residual grogginess or mild cognitive effects can persist up to 24 hours. This slow, extended timeline is exactly why edibles catch people off guard. Eating a second dose because “nothing is happening yet” is one of the most common mistakes, and it can lead to an uncomfortably intense experience hours later.
Colorado recommends waiting at least eight hours before driving after consuming less than 18 mg of THC in edible form. If you’ve taken more than that, the wait should be longer.
Sublingual Tinctures
Tinctures and oils held under the tongue split the difference between smoking and eating. THC absorbs through the thin tissue under your tongue directly into your bloodstream, bypassing the digestive system. Effects typically arrive within a few minutes, similar to inhalation. But the high is shorter, generally lasting about one to two hours before fading. This makes sublingual dosing one of the more predictable and controllable methods, since both the onset and offset are relatively quick.
Why Duration Varies From Person to Person
Two people can take the same dose and have noticeably different experiences. Several factors explain why.
- Tolerance: Regular users develop tolerance, meaning the same dose produces weaker and shorter-lasting effects over time. If you use cannabis daily, a dose that floors a newcomer might barely register.
- Body fat: THC is fat-soluble, meaning your body stores it in fatty tissue. People with higher body fat percentages may metabolize THC differently, and stored THC gets released slowly over time.
- Metabolism: A faster metabolic rate processes and clears THC more quickly. Age, activity level, and genetics all influence how fast your body breaks it down.
- Dose and potency: This one is obvious but worth stating. A 5 mg edible and a 50 mg edible are not going to produce the same duration of effects. Higher doses take longer to metabolize and extend both the peak and the tail end of the experience.
How Long THC Stays Detectable
The high fading does not mean THC has left your body. There’s a significant gap between how long you feel effects and how long THC shows up on tests. This distinction matters if you’re subject to drug screening.
In blood, THC is typically detectable for 2 to 12 hours after use. Heavy, chronic users can test positive in blood up to 30 days later. Saliva tests pick up THC for a shorter window, though frequent smokers have tested positive in oral fluid up to 72 hours after their last use.
Urine testing has the longest detection window and is the most common screening method. Occasional users may test positive for 10 to 14 days. If you use three to five times a week, that extends to roughly 45 days. Daily heavy users can test positive for up to 90 days. These timelines reflect THC’s fat-soluble nature: your body slowly releases stored THC from fatty tissue over weeks, long after any psychoactive effect has ended.
Residual Effects the Next Day
Even after the high wears off, THC can leave a subtle cognitive footprint. The CDC notes that cannabis use within the prior 24 hours has a measurable impact on thinking, attention, memory, coordination, and time perception. This is sometimes called a “weed hangover,” and it’s most common after high doses or edibles consumed later in the evening. You might feel foggy, slightly slower to react, or less sharp the morning after. These effects are temporary, but they’re real enough to affect driving, work performance, and anything requiring focused attention.
Quick Comparison by Method
- Smoking/vaping: Onset in seconds to minutes, peak around 10 to 40 minutes, main effects last 1 to 3 hours
- Edibles: Onset in 30 minutes to 2 hours, peak around 4 hours, main effects last 6 to 12 hours
- Sublingual tinctures: Onset in a few minutes, effects last 1 to 2 hours
For all methods, residual cognitive effects can linger up to 24 hours, especially at higher doses. If you need to drive, the safest approach is waiting at least six hours after smoking and at least eight hours after edibles, with longer waits for larger doses.