Key Takeaways
- A smoked or vaped high usually peaks fast and fades within 1 to 3 hours; an edible high lasts far longer, commonly 4 to 8 hours or more.
- "How long you feel high" and "how long some specific skills stay affected" are different questions — and the second can run longer than the noticeable high.
- In one small edible study, participants reported altered intoxication for up to 7 hours, while measurable driving changes were limited (Zhao et al., 2024, Journal of Cannabis Research).
- One small 2026 study found certain lab measures of balance and endurance still altered up to 12 hours after smoking — a task-specific finding, not proof of blanket 12-hour impairment (Abu-Ashour et al., 2026, Journal of Drug Education).
- Feeling sober isn't a perfect safety check: subjective high and objective performance don't always move together, so give demanding tasks like driving more time than your head suggests.
The single biggest factor in how long a high lasts is the method. Because of how cannabis moves through your body, inhaling and eating produce very different timelines:
So the quick rule: if you inhaled it, think in hours; if you ate it, plan around most of an evening — and possibly longer. For tinctures and sublingual products, effects may begin faster than conventional edibles, but timing varies because some of the dose is absorbed through the mouth and some is swallowed.
That's the "feeling high" clock. But it turns out that's not the whole story.
Here's what most guides get wrong: "how long does a high last" is really three separate questions, with three different answers.
1. How long you feel high (subjective intoxication). This is what people usually mean — the head-change. For inhaled cannabis, 1 to 3 hours; for edibles, longer. In a controlled edible study, participants reported altered subjective intoxication for up to 7 hours after an average 7.3 mg dose (Zhao et al., 2024, Journal of Cannabis Research).
2. How long specific skills stay affected. This is the one that matters for safety, and it's less tidy than the feeling. Different abilities — reaction time, memory, balance, coordination — recover on different timelines, and some can lag behind the subjective high. One small 2026 study found that certain laboratory measures of balance, force control, and muscular endurance remained altered up to 12 hours after smoking (Abu-Ashour et al., 2026, Journal of Drug Education). This does not mean everyone remains broadly impaired for 12 hours — it was a small, task-specific study — but it suggests some effects may outlast the noticeable high. For driving specifically, the broader research generally points to most driving-relevant skills recovering over a handful of hours after inhaling, with oral doses lasting longer — the point being that "the high wore off" and "I'm fully back to baseline" aren't always the same moment.
3. How long THC stays detectable in your body. This is a completely different question from how long you feel high — THC and its metabolites can linger in blood, urine, or saliva long after any effect is gone (days to weeks for frequent users), which is why passing a drug test and being high are unrelated. That's a topic in its own right — we cover how long cannabis stays in your system by test type in a separate guide
One recurring theme in the research is that subjective effects and objective performance don't always move in step. In the edible study, researchers found relatively limited measurable changes in the driving simulator, while participants continued to report intoxication and reduced willingness to drive for considerably longer (Zhao et al., 2024). In the physical-performance study, the gap ran the other way: perceived intoxication faded while some measured impairments lingered (Abu-Ashour et al., 2026).
The practical takeaway isn't that your judgment is useless — in the edible study, participants' reluctance to drive may well have been appropriately cautious. It's that your subjective high doesn't map perfectly onto every type of impairment, so feeling sober shouldn't be your only safety check. When it comes to driving or anything demanding, wait longer than you think you need to.
Within those ranges, several things stretch or compress the timeline:
How long does a smoking high last? Usually 1 to 3 hours for the main effects, peaking in the first half hour. Residual mellowness can linger a bit after that — and some specific skills may take longer to fully return than the feeling does.
How long does an edible high last? Commonly 4 to 8 hours, sometimes longer with a bigger dose, and slow to start (up to 2 hours). This is why edibles catch people out: long onset, long duration. Clear your schedule.
Why do I still feel "off" the next day? Some people genuinely report next-day grogginess or mental fog, especially after high doses or poor sleep. But controlled research has generally found little consistent evidence of measurable next-day impairment (for example, Suraev et al., 2024, in a next-day RCT). A 2026 study likewise found no overall cognitive difference between groups 12–15 hours after smoking, though higher-potency exposure was associated with poorer performance on some measures in some individuals (Matheson et al., 2026). So a "weed hangover" isn't universal or well established — but subjective reports of it are common.
If I don't feel high anymore, am I safe to drive? Not necessarily — this is the key safety point. Some skills can stay affected after the subjective high fades, and your own sense of intoxication is an imperfect guide. When in doubt, wait longer than you think you need to, and don't treat "I feel fine" as your only green light.
Does more THC make the high last longer? Generally yes — higher doses tend to produce stronger and somewhat longer effects, especially with edibles. But the relationship isn't perfectly proportional, and past a point you're mostly adding intensity and side effects.
If you smoked or vaped, expect the noticeable high to last 1 to 3 hours; if you ate an edible, plan for 4 to 8 or more. The more useful, less obvious lesson from the research is that duration depends on what you're measuring: the noticeable high usually ends well before THC becomes undetectable, and some specific skills may stay affected after the high fades — though how long depends on the dose, the route, the person, and the task. One small study finding a balance difference at 12 hours doesn't establish universal 12-hour impairment, but it's a useful reminder that "the high wore off" isn't the same as "I'm fully back to baseline." Use the time ranges as a guide to the experience, and give driving or other demanding tasks more margin than your subjective sense alone would suggest.
This article is for informational purposes only. Cannabis laws and product regulations vary by location — check what applies where you are.
Last updated: July 2026 | Based on: 4 human studies (2021–2026) from DeepWeed's knowledge base, on cannabis duration, driving and physical impairment, and next-day effects.