To give first aid for greening out at home, stop all cannabis use, have the person sit or lie down in a quiet, dim room, offer small sips of water, and stay with them until symptoms pass. Most episodes ease within 30 to 60 minutes and resolve within a few hours. Call 911 for chest pain, trouble breathing, seizure, unresponsiveness, or self-harm talk, and call Poison Control at 1-800-222-1222 for guidance.
Can CBD Bring You Down From a THC High? What to Expect
What does greening out feel like?
Greening out is acute cannabis intoxication, often from too much THC, edibles, or concentrates. Common signs include nausea, vomiting, dizziness, sweating, pale skin, a racing heartbeat, confusion, anxiety, and panic.
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Edible episodes tend to run longer than inhaled ones because the body digests THC slowly. Symptoms can build for two hours after eating and last six hours or more.
What should you do first?
- Stop cannabis use right away and put edibles, vapes, and drinks out of reach.
- Move the person to a quiet, dim room with fresh air and let them sit or lie on their side.
- Speak in short, calm sentences and reassure them that the feeling is temporary.
- Offer small sips of water every few minutes instead of a large glass.
- Place a cool, damp cloth on the forehead or back of the neck.
- Stay with them and check breathing and responsiveness every 15 minutes.
What if they are vomiting?
Turn them onto their side in the recovery position so the airway stays clear, and keep a bowl or bag within reach. Skip food until the stomach settles, then offer plain crackers, toast, or a light electrolyte drink. Do not force anything down while they are still retching.
What should you avoid doing?
- Do not give more cannabis, alcohol, caffeine, or energy drinks, since each can worsen a racing heart and panic.
- Do not leave a disoriented person alone or let them drive, bike, or use stairs unattended.
- Do not try to sober them up with a cold shower, black coffee, or forced food.
- Do not argue with paranoid thoughts or crowd them with questions.
How long does greening out last?
Inhaled THC peaks in about 10 to 30 minutes, and the worst of it usually fades within one to two hours. Edible effects can last four to eight hours, with a slower return to normal. Sleep, water, and time are the main remedies at home.
When is greening out an emergency?
Call 911 for chest pain, slow or stopped breathing, a seizure, fainting that does not wake up, severe confusion, or any talk of self-harm. These signs can point to a cannabis-related emergency or another medical problem.
Poison Control at 1-800-222-1222 answers questions about dosing, edible mistakes, and child exposures 24 hours a day. Have the product label, weight, and time of use ready when you call.
How can you lower the risk next time?
Start with 2.5 mg of THC or less in an edible and wait at least two hours before taking more. Keep alcohol out of the mix, choose lab-tested products from licensed shops, and note the THC percentage on the label. Some people find that CBD softens anxiety, though the evidence for it as a rescue remedy is limited.