The most important thing to know right now: what you’re feeling is temporary, it will pass, and there are specific things you can do in the next few minutes to bring the intensity down. Nothing dangerous is happening to your body. Your nervous system is in overdrive, and the techniques below work by pulling it back toward a calmer baseline.
How Long This Will Last
Your timeline depends on how you consumed cannabis. If you smoked or vaped, the effects hit within seconds but typically last only 1 to 2 hours. You’re likely already near or past the peak, and things will start easing soon.
Edibles are a different story. They take 30 to 90 minutes to kick in, peak between 2 and 4 hours, and can linger for up to 10 to 12 hours total. If you ate something and it hit harder than expected, you may still be climbing toward the peak. Knowing this helps because the anxiety often comes from feeling like it will never end. It will. You just need to ride through the most intense window.
Slow Your Heart Rate With Cold Water
This is the fastest physical reset available to you. Splash cold water on your face, focusing on the area around your nose and eyes. Better yet, fill a bowl with cold water and dip your face in it for 15 to 30 seconds. This triggers something called the mammalian dive reflex, a built-in survival response that automatically slows your heart rate, shifts blood flow toward your brain and heart, and puts your body into a kind of power-saving mode. You don’t need to understand the biology for it to work. Just get cold water on your face and you’ll feel the shift within seconds.
A cold shower works too, but the face is where the response is strongest. If your heart is racing and that’s fueling your panic, start here.
Breathe to Activate Your Calming System
Your nervous system has a built-in brake pedal, and you can press it with your breathing. The key is making your exhale longer than your inhale. Breathe in through your nose for a count of six, then out through your mouth for a count of eight. Watch your belly expand on the inhale and flatten on the exhale. If six and eight feel too long, try four and six. The ratio matters more than the specific numbers.
Do this for just two to three minutes. You’re stimulating a major nerve that runs from your brain down through your chest and abdomen, and when you activate it, your heart rate drops, your blood pressure comes down, and your body gets the signal that you’re safe. This isn’t a suggestion to “just breathe.” It’s a physiological lever that directly counteracts the fight-or-flight response THC can trigger.
Use the 5-4-3-2-1 Grounding Technique
When your thoughts are spiraling, grounding pulls your attention out of your head and into your immediate surroundings. The simplest version: name five things you can see, four things you can touch, three things you can hear, two things you can smell, and one thing you can taste. Say them out loud if you can. The goal is to force your brain to process real sensory input instead of looping on anxious thoughts.
Pick up something with an interesting texture, like a blanket, a piece of fruit, or ice cubes. Feel the weight and temperature. This kind of focused sensory attention works because your brain can only process so much at once, and filling it with concrete physical details leaves less room for the spiral.
Eat Something With Protein or Fiber
If you haven’t eaten recently, low blood sugar could be making everything worse. Symptoms of unstable blood sugar closely mirror anxiety: irritability, nervousness, and a general sense that something is wrong. Cannabis can suppress your appetite or make you forget to eat, and dipping blood sugar on top of THC-induced anxiety creates a feedback loop.
Reach for something with protein or fiber rather than candy or chips. Nuts, cheese, peanut butter on toast, a banana, or eggs are all good choices. These foods stabilize blood sugar gradually instead of spiking and crashing it. Avoid sugary drinks and refined carbohydrates, which can make the rollercoaster worse. Drink water too. Dehydration amplifies the physical discomfort, and having something simple to sip gives your hands and mouth something to do.
Try Smelling or Eating Citrus
This one sounds odd, but there’s real science behind it. Limonene, the compound that gives lemons, limes, and oranges their smell, has been shown to directly reduce THC-induced anxiety. A study in healthy adults found that when limonene was administered alongside THC, ratings of “anxious/nervous” and “paranoid” dropped significantly compared to THC alone, and the effect was dose-dependent (more limonene meant less anxiety).
You don’t need a supplement. Peel an orange and smell it. Zest a lemon near your nose. Squeeze lemon juice into water and drink it. Limonene is one of the most abundant compounds in citrus peels, and even inhaling it can help. When limonene was given without THC, it had no noticeable effect on its own, meaning it’s specifically counteracting the anxiety THC creates rather than acting as a general sedative.
Skip the CBD
You may have heard that CBD can “cancel out” a THC high. This is one of the most widespread pieces of cannabis advice, and recent research suggests it’s wrong, at least for edibles. A Johns Hopkins study found that when participants consumed the same dose of THC alongside a high dose of CBD, the THC in their blood nearly doubled compared to THC alone. Participants also reported stronger overall drug effects, more unpleasant sensations, greater difficulty performing routine tasks, and a larger increase in heart rate (25 beats per minute above baseline versus 10 with THC alone).
The reason: CBD interferes with how your body breaks down THC, causing more of it to circulate for longer. So if you’re already uncomfortably high, taking CBD could make the experience more intense, not less. Put the CBD away and use the other techniques here instead.
Change Your Environment
Sometimes the simplest intervention is the most effective. If you’re inside, step outside for fresh air. If you’re in a loud or crowded place, move somewhere quieter. Turn off whatever you’re watching if it’s adding to the anxiety. Put on music you associate with feeling safe or happy, something familiar and low-key.
If you’re with people and the social interaction feels overwhelming, it’s fine to say you need a few minutes alone. Lie down if you want to. Close your eyes. Remind yourself out loud that you consumed a substance, it’s affecting your brain chemistry temporarily, and your body is going to process it and return to normal. Sometimes just hearing that in your own voice helps more than thinking it silently.
Signs That Need Medical Attention
The vast majority of “too high” experiences are uncomfortable but not dangerous. However, if you’re experiencing repeated vomiting that won’t stop (especially if you use cannabis regularly), watch for signs of severe dehydration: very dark urine, sudden confusion, fainting, extreme dizziness, or a heart rate that stays rapid even after trying the breathing and cold water techniques above. Cyclic vomiting after cannabis use is a recognized condition, and dehydration from it can become serious enough to need IV fluids. If those symptoms show up, that’s a reason to call for help or go to an emergency room.