A THC high from smoking or vaping typically lasts 1 to 3 hours, while edibles can keep you feeling high for 6 to 8 hours. But the full picture is more nuanced than that. How you consumed cannabis, how much you used, and your individual tolerance all shift the timeline. And feeling sober again isn’t the same as being fully unimpaired.
Smoking and Vaping: The Shortest Window
When you inhale cannabis, THC crosses from your lungs into your bloodstream almost immediately. You can feel the effects within minutes, and they peak shortly after. The whole experience usually wraps up in 1 to 3 hours, though some people report lingering effects for up to 8 hours, especially with higher-potency products or larger doses.
This faster timeline exists because inhaled THC goes straight to your brain without passing through your digestive system first. It hits hard but clears relatively quickly compared to other methods.
Edibles: A Much Longer Ride
Edibles follow a completely different timeline. They typically take 30 to 60 minutes to kick in because the THC has to travel through your stomach and get processed by your liver before it reaches your bloodstream and brain. Peak effects hit around 3 hours after eating, and the overall high generally lasts 6 to 8 hours.
This is where people often get into trouble. The delayed onset leads some users to take a second dose thinking the first one didn’t work, only to have both hit at once. If you’re waiting for an edible high to wear off, expect a significantly longer wait than you’d have with smoking. The liver processing also converts THC into a more potent form, which partly explains why edible highs tend to feel stronger and last longer even at similar doses.
Factors That Change the Timeline
Several variables can stretch or shorten how long you feel high:
- Dose and potency: Higher THC concentrations and larger amounts produce longer, more intense effects. A single puff of moderate-strength flower wears off much faster than a large dab of concentrate.
- Tolerance: Regular users metabolize THC more efficiently and often feel effects for a shorter window than occasional users.
- Body composition: THC is fat-soluble, meaning it gets stored in fat tissue. People with higher body fat percentages may process it differently.
- Food intake: Using cannabis on an empty stomach, especially with edibles, can speed up onset but may also intensify the experience.
The Next-Day Hangover
Some people feel completely fine the morning after using cannabis. Others wake up with fatigue, brain fog, dry mouth, headaches, or mild nausea. These “weed hangover” symptoms are well-documented anecdotally, though scientific research on them has produced mixed results. A 2023 review found that some studies showed THC affected cognition the following day, while many others did not.
One explanation is straightforward: residual THC in your blood. If you consumed a large dose, especially from edibles, you may still have enough THC circulating the next morning to feel slightly off or even mildly high. There’s no set duration for these after-effects, and not everyone experiences them at all. They’re most common after heavy use or high-dose edibles consumed later in the evening.
Feeling Sober vs. Actually Unimpaired
This distinction matters, particularly if you plan to drive or do anything requiring sharp reflexes and judgment. Your subjective sense of being “back to normal” often arrives well before your cognitive and motor functions fully recover.
Canadian medical guidelines recommend waiting at least 6 hours after inhaling cannabis and at least 8 hours after eating an edible before driving, while acknowledging that impairment may last longer than that. Health Canada notes that cannabis can impair mental alertness and physical coordination for up to 24 hours. An occupational medicine position statement goes further, recommending that people avoid driving, operating equipment, or performing safety-sensitive tasks for at least 24 hours after use.
The gap between feeling sober and being fully unimpaired is real. Reaction time, attention, and divided-task performance can remain subtly degraded even after the high feels like it’s gone. This is especially true for infrequent users, who may underestimate how long residual impairment lasts, and for anyone who consumed a high dose.
Quick Reference by Method
- Smoking/vaping: Onset in minutes, peak almost immediately, high lasts 1 to 3 hours (up to 8 in some cases).
- Edibles: Onset in 30 to 60 minutes, peak around 3 hours, high lasts 6 to 8 hours.
- Residual effects: Possible next-day grogginess or brain fog, especially after high doses.
- Full impairment clearance: Possibly up to 24 hours for safety-sensitive tasks like driving.