A cannabis high from smoking or vaping typically wears off in 1 to 3 hours, while edibles can keep you elevated for 6 to 8 hours. The exact timeline depends on how you consumed it, how much you took, and your individual biology. Here’s what to expect for each method and the factors that shift the window.
Smoking and Vaping: 1 to 3 Hours
When you smoke or vape cannabis, the first effects hit within 2 to 10 minutes. The high builds quickly from there, reaching its peak around 15 to 30 minutes in. After that peak, the intensity declines steadily, and most people feel back to baseline within 2 to 3 hours.
This relatively short window is because THC enters your bloodstream directly through your lungs, bypassing the digestive system entirely. It reaches your brain fast, peaks fast, and clears fast. For occasional users, THC in blood plasma drops below detectable levels within 8 to 12 hours, well after the subjective high has faded.
Edibles: 6 to 8 Hours
Edibles follow a completely different timeline. They take 30 to 60 minutes to kick in because the THC has to pass through your stomach and liver before reaching your bloodstream. Peak blood levels don’t arrive until about three hours after you eat the dose, which is when the high feels most intense. The full experience generally lasts 6 to 8 hours, sometimes longer with higher doses.
This extended duration catches a lot of people off guard, especially first-time users who eat more after 45 minutes because they “don’t feel anything yet.” The slow onset is normal. If you’ve taken an edible and feel nothing after an hour, the worst move is to take another dose, because the first one may still be building toward its peak.
Psilocybin Mushrooms: 4 to 6 Hours
If your search is about psychedelic mushrooms rather than cannabis, the timeline is different again. Effects begin roughly 30 to 60 minutes after ingestion, with peak psychedelic intensity arriving around 1.5 to 2 hours in. That peak lasts 1 to 3 hours. From there, a gradual comedown stretches across hours 4 through 6, during which mental clarity starts returning though some visual effects may linger. By 6 to 8 hours, most effects have faded, though mental fatigue or a subtle “afterglow” can persist into the evening.
Impairment Lasts Longer Than the High
Feeling sober and being unimpaired are not the same thing. Colorado’s Department of Transportation, drawing on traffic safety research, puts the impairment windows noticeably longer than the subjective high:
- Smoking, dabbing, or vaping: up to 4 hours of impairment
- Edibles: at least 8 hours of impairment
- THC drinks or tinctures: up to 6 hours of impairment
Some high-potency or unregulated products can cause intoxicating effects lasting longer than 12 hours. As little as 10 mg of THC can be enough to impair driving ability, reaction time, and decision-making, even if you feel mostly fine. The tail end of a high is deceptive: you may feel clear-headed while your coordination and judgment are still measurably off.
Why Duration Varies Between People
Two people can take the same dose and have noticeably different experiences. Several factors explain this.
Genetics play a larger role than most people realize. About one in four people carry a gene variant that causes their liver enzymes to break down THC less efficiently. For these individuals, the same dose produces a stronger and longer-lasting high compared to someone who metabolizes THC quickly. This is one reason some people feel “too high” from doses their friends handle easily.
Tolerance is the other major variable. Regular users develop tolerance to THC’s effects over time, meaning the high feels shorter and less intense at the same dose. An occasional user might feel elevated for a full 3 hours from a single joint, while a daily user might feel baseline again in under 90 minutes.
Body composition matters because THC is highly fat-soluble. It gets absorbed into fatty tissue and then slowly releases back into the bloodstream. People with higher body fat percentages may experience slightly prolonged effects, and frequent users can accumulate THC in tissue over time. The elimination half-life of THC from the body is estimated at 3 to 4 days, driven by this slow redistribution from fat stores back into the blood.
The “Weed Hangover” Question
Many people report feeling foggy, sluggish, or slightly off the morning after using cannabis, especially after edibles or high doses. But when researchers at the University of Sydney conducted the first systematic review of “next day” cannabis effects, examining 20 published studies, they found very little evidence of measurable impairment beyond the 8-hour mark. Out of 345 performance tests administered across the studies, only 12 (about 3.5%) showed significant next-day deterioration.
That doesn’t mean you’ll feel perfectly sharp the next morning. Subjective grogginess is real, particularly after heavy use or poor sleep. But in terms of measurable cognitive performance, the data suggests most people return to normal function within 8 hours of use. If you consistently feel impaired the next day, the dose, timing, or frequency of use is worth reconsidering.