The most effective way to come down from being too high is to change your physical environment, slow your breathing, and wait it out. There’s no instant off switch for THC, but several strategies can significantly reduce the intensity and shorten how long you feel uncomfortable. If you smoked or vaped, the worst of it will pass within 2 to 3 hours. If you ate an edible, expect the peak somewhere around 2 to 4 hours after you ate it, with effects potentially lingering much longer.
You’re going to be fine. Nobody has ever fatally overdosed on cannabis. What you’re feeling is temporary, even if it doesn’t feel that way right now.
Breathe Slowly and Get Grounded
The fastest thing you can do right now is slow your breathing. Inhale for 3 to 4 seconds, hold for a second or two, then exhale for 3 to 4 seconds. Place a hand on your stomach and feel it expand with each breath. This activates your parasympathetic nervous system, which directly counteracts the racing heart and tight chest that come with being too high. Keep going until your breathing feels more natural.
If you’re dealing with paranoia or a sense that things aren’t real, try the 5-4-3-2-1 technique: identify five sounds you can hear, four textures you can touch, three objects you can see, two scents you can smell, and one thing you can taste. This pulls your brain out of the anxious loop and reconnects you with the physical world around you. Even just picking up a nearby object, running your fingers over it, and focusing on its shape and texture can serve as an anchor.
Sit or lie down somewhere comfortable. Close your eyes if that helps, and repeat something simple to yourself: “I’m safe. This is temporary. I’ll feel better soon.” It sounds basic, but giving your brain a concrete, reassuring thought to hold onto works far better than trying to fight the feeling or reason your way out of it.
Cold Water on Your Face
Splashing cold water on your face triggers something called the dive reflex, a built-in physiological response that slows your heart rate and calms your nervous system. Research on this reflex found that cold water applied to the face dropped heart rate by roughly 30 to 35 beats per minute and significantly reduced self-reported feelings of anxiety and panic. The colder the water relative to the air around you, the stronger the effect.
You don’t need a full cold shower. Just fill your cupped hands with the coldest water from the tap and press it against your forehead, cheeks, and around your eyes for 15 to 30 seconds. Repeat a few times. This is one of the most immediate physical tools you have.
Sniff or Chew Black Peppercorns
This is one of the most widely repeated tips for coming down from a high, and there’s a reason it works for many people. Black pepper contains a terpene called beta-caryophyllene, which activates CB2 receptors in the body’s endocannabinoid system. While it doesn’t directly block the same receptors THC binds to (CB1), the overall effect on the endocannabinoid system appears to take the edge off. Chew two or three whole black peppercorns, or simply crack some into your hand and inhale deeply. The strong sensory jolt alone can help pull you out of a spiral.
Try Lemon Zest or Citrus
Lemons and other citrus fruits are rich in limonene, a terpene found naturally in cannabis itself. A 2024 clinical study in healthy adults found that limonene selectively reduced the anxious, paranoid feelings caused by THC, though it didn’t significantly change other cognitive effects like memory impairment. In practical terms, it may help you feel less panicked without necessarily making you less “out of it.” Squeeze some lemon into water and drink it, or simply peel an orange and breathe in the scent from the rind.
Eat Something and Drink Water
THC lowers fasting insulin levels by about 16%, which can contribute to that shaky, lightheaded, slightly hollow feeling. Eating something with carbohydrates and a bit of fat, like toast with peanut butter, crackers, or a banana, gives your body fuel to stabilize. It also gives you something mundane and physical to focus on, which is grounding in itself.
Drink water steadily but don’t force it. Dehydration makes anxiety worse and amplifies the dry mouth and headache that often come with being too high. Avoid alcohol entirely, as it increases THC absorption and will make everything worse.
Skip the Coffee
Reaching for caffeine to “snap out of it” is a common instinct, but research in animal models found that caffeine actually made THC’s cognitive effects worse, not better. A low dose of THC combined with caffeine produced memory deficits comparable to a much higher dose of THC alone. Coffee will also increase your heart rate, which is the last thing you need when you already feel like your heart is pounding. Stick to water, juice, or herbal tea.
CBD May Help, but It’s Not Instant
CBD acts as a negative allosteric modulator of the CB1 receptor, which in plain terms means it changes the shape of the receptor so THC can’t bind to it as effectively. Lab studies show it reduces both the potency and the maximum effect THC can produce at that receptor. If you have a CBD tincture or oil on hand, placing some under your tongue is worth trying. But this is not an instant antidote. Onset takes time, and the clinical evidence for specific doses in humans during an acute high is limited. It’s a helpful addition to everything else on this list, not a silver bullet.
How Long Until You Feel Normal
Your timeline depends entirely on how you consumed THC. If you smoked or vaped, the high peaks around 20 to 30 minutes after inhalation and tapers off within 2 to 3 hours. If you ate an edible, you’re looking at a peak somewhere between 2 and 4 hours after eating it, and the full experience can take up to 24 hours to fully clear. This is why edibles are responsible for the majority of “too high” experiences: they hit later, they hit harder, and they last much longer.
The most uncomfortable phase, the peak, is the part that passes. Once you’re past it, each hour gets easier. Sleeping through the tail end is perfectly fine and often the best option if you’re able to.
When It’s More Than Just Being Too High
Severe, repeated vomiting after cannabis use is a distinct condition called cannabinoid hyperemesis syndrome. It involves intractable nausea, crampy abdominal pain, sweating, and sometimes diarrhea. If you can’t keep water down and the vomiting doesn’t stop, that’s not a normal “greening out” and may require medical attention for dehydration or electrolyte problems. Chest pain, fainting, or a seizure also warrant calling for help.
Preventing This Next Time
If you’re using edibles, the recommended starting dose for someone without a tolerance is 1 to 2.5 milligrams of THC. Many commercial edibles contain 5 or 10 milligrams per piece, which is already two to ten times a beginner dose. Start with half or a quarter of a piece and wait at least 90 minutes before deciding whether to take more. The delayed onset of edibles is the single biggest reason people overconsume: they feel nothing at the 30-minute mark, eat another piece, and then both doses hit at once.
With flower, take one hit and wait 15 minutes. You can always add more. You can never subtract.