A bad high is uncomfortable and sometimes frightening, but it will pass. If you smoked or vaped, the worst of it typically fades within two to three hours. If you ate an edible, effects can last six to ten hours, though the peak intensity won’t hold that entire time. Everything below is designed to shorten the misery and help you ride it out.
Slow Your Breathing First
The single most effective thing you can do right now is change how you’re breathing. When THC triggers anxiety, your breathing gets shallow and fast, which feeds the panic loop. Breathe in slowly through your nose for four counts, hold for four, and exhale through your mouth for six. Do this for a few minutes before you try anything else. It won’t eliminate the high, but it dials down the physical panic response enough to let the other strategies work.
Change Your Environment
Sensory input that would normally be fine can feel overwhelming when you’re too high. Move to a quieter room, dim the lights, and sit or lie down somewhere you feel safe. If you’re at a party or crowded space, step outside for fresh air. The goal is to reduce the total amount of stimulation your brain is trying to process. Turning off music, putting your phone face-down, and avoiding screens can all help. A cool, damp cloth on your forehead or the back of your neck gives your nervous system a calming signal to focus on instead of the racing thoughts.
Try the 5-4-3-2-1 Grounding Technique
This is a structured way to pull your attention out of your head and back into your body. It works well for drug-induced panic because it forces your brain to process real sensory data instead of spiraling. Here’s how it goes:
- 5 things you can see. Name them out loud or in your head. A lamp, a crack in the ceiling, the color of the wall.
- 4 things you can touch. Feel the texture of the couch, the weight of a blanket, the ground under your feet.
- 3 things you can hear. A fan humming, traffic outside, your own breathing.
- 2 things you can smell. Soap, a pillow, food in the kitchen.
- 1 thing you can taste. Gum, water, the inside of your mouth.
Repeat the exercise as many times as you need. Each round anchors you a little more firmly in reality and reminds your brain that you’re in a safe, normal environment.
Sniff or Chew Black Pepper
This one sounds odd, but it has a real biological basis. Black pepper contains a terpene called beta-caryophyllene, which interacts with the same receptor system that THC acts on. Specifically, it activates the CB2 cannabinoid receptor, which plays a role in regulating inflammation and immune response. Chewing two or three whole peppercorns or simply sniffing ground black pepper can take the edge off anxiety within a few minutes. You don’t need much, and the effect is mild, but many people find it genuinely helpful.
Smell or Eat Lemon
Lemons and lemon peel contain a terpene called limonene that appears to directly counteract THC-induced anxiety. A 2024 study in humans found that limonene reduced THC-related feelings of nervousness and paranoia in a dose-dependent way, meaning more limonene produced more relief. At the highest dose tested alongside a strong THC dose, participants rated themselves significantly less anxious and paranoid compared to THC alone. Zesting a lemon peel, squeezing lemon into water, or even just holding a cut lemon under your nose are all reasonable ways to get some limonene exposure quickly.
Eat Something and Drink Water
THC can drop your blood sugar, which adds dizziness, nausea, and shakiness on top of the anxiety. Eating something simple and carb-rich (crackers, toast, fruit, a granola bar) helps stabilize blood sugar and gives you a grounding physical activity to focus on. Sip water steadily rather than chugging it, especially if you feel nauseous. Avoid alcohol and caffeine, both of which can intensify the high or add new layers of discomfort.
CBD Can Help If You Have It
If you have CBD oil, a tincture, or a gummy available, it can meaningfully reduce the intensity of a THC high. CBD works by changing the shape of the same receptor THC binds to, making THC less effective at activating it. It doesn’t compete with THC directly. Instead, it reduces THC’s potency in a way that THC can’t overcome by just being present in larger amounts. A dose of 25 to 50 mg of CBD is a reasonable starting point. This won’t instantly end the high, but it can soften the peak and shorten the tail.
How Long This Will Last
Knowing the timeline helps more than almost anything else, because a bad high feels like it will never end.
If you smoked or vaped, intoxication starts within minutes and typically lasts two to three hours total. The most intense period is usually the first 30 to 45 minutes, then it gradually tapers. By the two-hour mark, most people feel significantly more normal.
Edibles are a different story. Onset is delayed by one to two hours, which is why many bad edible experiences happen after someone takes a second dose thinking the first one didn’t work. Effects can persist for six to ten hours, with the peak somewhere around hours two through four. If you’re in the middle of an edible high, the most useful thing to know is that intensity comes in waves. It may feel like it’s getting worse, then ease up, then surge again. Each wave is typically less intense than the last.
What to Do If Someone Else Is Having a Bad High
Stay calm and speak in a low, steady voice. Remind them that what they’re feeling is temporary and caused by THC, not a medical emergency. Don’t argue with irrational thoughts or try to reason someone out of paranoia. Instead, redirect their attention: ask them to describe what they see, hand them something cold to hold, or guide them through the breathing exercise above. Your calm presence is the single most powerful tool you have.
If the person cannot be woken up, is having trouble breathing, or is experiencing what looks like a psychotic episode (complete detachment from reality, not just paranoia), call 911. Cannabis alone is extremely unlikely to cause a fatal overdose, but these symptoms warrant medical evaluation, especially if you’re not sure what else they may have consumed.
Preventing It Next Time
Most bad highs come down to dose. Modern cannabis products, especially edibles and concentrates, can deliver far more THC than a person expects. Start with a lower dose than you think you need, particularly with edibles, where 5 mg is a reasonable starting point for someone without a strong tolerance. Wait at least two hours before taking more. Mixing cannabis with alcohol dramatically increases the likelihood of a bad experience. Being in an unfamiliar or stressful environment also raises your risk, since THC tends to amplify whatever emotional state you’re already in.
Keeping CBD, black peppercorns, or lemons on hand before you consume cannabis means you’ll have your toolkit ready if things go sideways. Most people who’ve had one bad high never have another, simply because they learn their threshold and stay within it.