Greening out is acute THC overconsumption, and its symptoms include nausea, vomiting, dizziness, a rapid or pounding heartbeat, sweating, pale skin, confusion, panic, and a heavy detached feeling. Symptoms usually peak 30 to 60 minutes after smoking or vaping and 1 to 3 hours after edibles, then ease over the next few hours. Most people recover fully at home, but some cases need medical care.
how long does a green out last
What are the most common green out symptoms?
Physical symptoms often arrive first and can feel like a sudden wave of illness.
what does green out mean
- Nausea and vomiting
- Dizziness, lightheadedness, or fainting
- Fast or pounding heartbeat
- Sweating, chills, or clammy and pale skin
- Shaky hands and muscle twitching
- Headache, dry mouth, and red eyes
- Extreme sleepiness with trouble actually sleeping
Psychological symptoms can be just as intense as the physical ones.
what causes a green out
- Panic, dread, or a sense that something is very wrong
- Confusion, slowed thinking, or trouble forming sentences
- Feeling detached from your body or the room around you
- Paranoia and racing thoughts
- Worsening of existing anxiety
How long do green out symptoms last?
Inhaled THC hits the bloodstream within minutes, so a green out from smoking or vaping typically peaks in about 30 to 60 minutes and fades within 1 to 3 hours. Edibles are slower because THC is processed through the liver, so symptoms may not start for 1 to 3 hours and can last 6 to 12 hours or longer. Very high edible doses can keep someone uncomfortable for a full day.
What helps when you are greening out?
The goal is to stop adding THC, stay safe, and let the body clear the drug. Time is the main treatment.
- Stop using cannabis right away, including vapes, drinks, and topicals with THC.
- Move to a quiet, calm, well-lit room and sit or lie down on your side if you feel sick.
- Sip water or a sports drink slowly to replace fluids lost from vomiting.
- Breathe slowly, in through the nose for four counts and out for six.
- Try ice chips, a cool cloth, or plain crackers if your stomach allows.
- Avoid alcohol, caffeine, and any other drug, which can make panic and heart rate worse.
- Do not drive or operate anything until you feel normal again.
- Sleep if you can, since most people wake up feeling back to baseline.
Folk remedies like chewing black peppercorns or taking CBD are often mentioned, but evidence for them is thin. They are not a substitute for medical care.
When is greening out a medical emergency?
Call 911 or reach a poison control center if symptoms go beyond a bad high. In the US, the national Poison Help line is 1-800-222-1222.
- Chest pain, irregular heartbeat, or trouble breathing
- Seizure, fainting, or trouble waking someone up
- Vomiting that will not stop or signs of dehydration
- Confusion or agitation that keeps getting worse
- Thoughts of self-harm
- Any accidental edible ingestion by a child or pet
Children who eat THC edibles can become very drowsy and unresponsive, so treat any exposure as urgent.
Is greening out the same as cannabis poisoning?
Severe greening out is THC toxicity, and the terms overlap. Poison centers classify cases by severity, from mild drowsiness to serious heart, breathing, and brain effects. Modern cannabis products with high THC concentrations make these reactions more likely than they were with older, lower-potency flower.
Does greening out mean cannabinoid hyperemesis syndrome?
No. Greening out is a short-term reaction to too much THC at once. Cannabinoid hyperemesis syndrome is a separate condition that develops after months or years of heavy, frequent use and causes repeated bouts of vomiting, often relieved by hot showers.
How do you lower your risk of greening out next time?
Dose control is the single biggest factor. Edibles are the most common cause of severe green outs because the effects are delayed and people redose too soon.
- Start with 2.5 to 5 mg of THC if you are new or sensitive.
- Wait at least 2 hours before taking more of an edible.
- Check labels for total THC per package, not just per serving.
- Skip alcohol and other substances at the same time.
- Try a product with a balanced THC to CBD ratio or a lower THC strain.
- Use with someone you trust, especially in a new setting.