You can’t instantly eliminate THC from your system, but you can take steps to feel more grounded and ride out the worst of it faster. Most cannabis highs from smoking or vaping last 2 to 3 hours, with the peak hitting in the first 30 to 60 minutes. If you ate an edible, you’re looking at a longer window of 6 to 10 hours, though most people feel normal by the next day. The good news: nobody has ever died from a cannabis overdose, and what you’re feeling will pass.
Why You Can’t Just “Turn It Off”
THC binds to receptors throughout your brain that regulate mood, memory, coordination, and time perception. Once those receptors are activated, you have to wait for your body to metabolize the THC and clear it. There’s no pill or trick that flushes it out instantly. Everything below is about managing symptoms and helping your body’s calming systems kick in while you wait.
Breathing and Cold Water
The most reliable thing you can do right now costs nothing. Slow, deep breathing activates your vagus nerve, which is the main line connecting your brain to your “rest and digest” system. When you stimulate it, your heart rate slows, your blood pressure drops, and anxiety eases. Try breathing in for 4 counts, holding for 4, and exhaling for 6 to 8. The longer exhale is what shifts your nervous system toward calm.
Splashing cold water on your face or holding ice cubes in your hands triggers the same vagus nerve response. A cold shower works too if you can manage it. The sudden temperature change pulls your attention out of your head and into your body, which can break a spiral of paranoia or racing thoughts. Humming, singing, or even gargling water also stimulate the vagus nerve, though they feel less dramatic.
Eat Something (But Not Fatty Foods)
Eating a meal or snack can help you feel more grounded. Simple carbohydrates and sugary foods give your brain something else to process and can take the edge off. However, skip the greasy pizza or ice cream if you’re trying to come down. Research from the University of Minnesota found that high-fat foods dramatically increase how much cannabinoid your body absorbs, boosting blood levels by as much as 14 times compared to an empty stomach. That study looked at CBD rather than THC, but the absorption mechanism is similar. If you took an edible and still have unabsorbed THC in your gut, a fatty meal could actually intensify your experience.
Stick to toast, crackers, fruit, or a bowl of cereal. Drink water or juice. Dehydration makes the dry mouth and foggy feeling worse, and having something cold to sip gives you a small sensory anchor.
CBD May Take the Edge Off
If you have a CBD product on hand (a tincture, gummy, or vape), it may help dial down the intensity. CBD acts as an allosteric modulator at the same brain receptor THC targets. In plain terms, it changes the shape of the receptor slightly so THC can’t activate it as strongly. It doesn’t block THC completely, but it can soften the psychoactive effects, particularly anxiety and paranoia. Look for a product that contains CBD without additional THC. Sublingual tinctures (held under the tongue) absorb faster than gummies.
Black Pepper and Lemon: What the Science Says
You’ll see advice online to chew black peppercorns or sniff ground pepper to calm down. The idea has a theoretical basis: black pepper contains a terpene called caryophyllene that interacts with cannabinoid receptors and has shown anti-anxiety properties in animal studies. But researchers at Johns Hopkins and the University of Maryland have both pointed out that no controlled human trials have tested whether peppercorns actually reduce cannabis anxiety. Even if the mechanism works in principle, nobody knows how many peppercorns you’d need to eat, and eating a handful is genuinely unpleasant.
Lemons get a similar reputation thanks to limonene, another terpene. A controlled study in humans found that vaporized limonene did selectively reduce the anxious effects of THC without changing how much THC was in participants’ blood. That’s promising, but sniffing a lemon peel delivers far less limonene than the doses used in research. Still, the strong citrus smell can serve as a grounding sensory distraction, which has value on its own even if the chemistry isn’t doing much at that dose.
Neither remedy is proven, but neither is harmful. If smelling pepper or squeezing a lemon makes you feel more in control, the placebo effect alone may be worth it when you’re panicking.
Distraction and Environment
Your mental state shapes the experience more than most people realize. Anxiety feeds on itself: you notice your heart racing, which makes you more anxious, which makes your heart race faster. Breaking that loop is half the battle.
Change your environment. If you’re at a party, step outside or into a quieter room. If you’re already home, move to a different spot. Put on a familiar, comforting show or album. Call or text someone you trust. The goal is to redirect your attention away from monitoring how high you feel. Video games, coloring, or even organizing a drawer can work because they occupy just enough mental bandwidth to interrupt the anxiety cycle without demanding real cognitive effort.
What Not to Do
- Don’t drink alcohol. It increases THC absorption and can make nausea, dizziness, and disorientation significantly worse.
- Don’t consume more cannabis thinking a different strain will “balance it out.” More THC is more THC.
- Don’t take a hot shower if you feel faint. Heat dilates blood vessels and can drop your blood pressure further, increasing the chance you’ll pass out. Stick to cool or lukewarm water.
- Don’t fight it too hard. Lying down, closing your eyes, and accepting the sensation often resolves things faster than pacing and panicking. If the room spins when you close your eyes, keep one foot on the floor and focus on a fixed point.
Edibles Are a Different Situation
If you ate too much of an edible, your timeline is longer and the intensity can keep climbing for up to two hours after ingestion. The liver converts THC into a more potent form during digestion, which is why edible highs feel stronger and last longer than smoking the same amount. You cannot vomit it up effectively once it’s been absorbed, and inducing vomiting carries its own risks.
The best strategy with edibles is patience. Find a safe, comfortable place. Set a timer on your phone for two hours so you can see proof that time is actually passing (because it will feel like it isn’t). Remind yourself that the peak will flatten. Most people who eat too much of an edible feel substantially better within 4 to 6 hours and fully normal by the next morning.
When It’s More Than Just Being Too High
Occasionally, what feels like being “too high” involves other substances. If you or someone else experiences chest pain, seizures, repeated vomiting, loss of consciousness, or confusion that worsens rather than improves over time, that’s beyond a normal cannabis reaction. Cannabis alone doesn’t cause those symptoms in healthy adults at typical doses, and their presence suggests something else is going on. Call emergency services in that situation without hesitation.