How Long Does a Green Out Last?
A green out usually lasts 1 to 4 hours when you smoke or vape cannabis. Edible cannabis changes the timeline: symptoms can run 6 to 12 hours, with a slow fade after the peak. The most intense part, nausea, dizziness, and panic, tends to peak within 1 to 2 hours and then eases.
What a Green Out Is
A green out is acute cannabis overconsumption. Too much THC triggers a mix of physical and mental symptoms. Common signs include nausea, vomiting, cold sweats, pale skin, dizziness, racing heart, anxiety, and a sense of losing control. It is uncomfortable but rarely dangerous on its own. The exception is when other substances or health conditions are involved.
Timeline by Method
- Smoking or vaping: Effects start in minutes. Peak at 15 to 30 minutes. Green out symptoms usually resolve in 1 to 4 hours.
- Edibles and drinks: Onset takes 30 minutes to 2 hours. Peak can hit at 2 to 4 hours. Symptoms can last 6 to 12 hours, and grogginess may continue the next day.
- High-dose concentrates: Onset is fast, and the intensity can be higher. Duration is similar to smoked flower but may feel longer because the dose is larger.
What Makes It Last Longer
- Eating cannabis instead of inhaling it.
- Taking a large dose, especially 50 mg of THC or more.
- Using on an empty stomach.
- Mixing cannabis with alcohol or other drugs.
- Having a low tolerance.
What to Do While It Passes
- Sit or lie down in a safe, quiet place.
- Sip water or a sports drink to stay hydrated.
- Eat a small, bland snack if your stomach allows it.
- Breathe slowly and focus on a fixed point or sound.
- Do not use more cannabis, alcohol, or caffeine.
- Ask a trusted person to stay with you.
- Call Poison Control or seek medical care if symptoms are severe.
When to Get Help
Get medical help if you have chest pain, a seizure, severe vomiting that will not stop, confusion, hallucinations, or thoughts of self-harm. Also seek care if symptoms last more than 12 hours or get worse after 4 hours. For children and teens, treat any cannabis overdose as an emergency.
Green Out vs. Panic Attack: A Comparison Review
How to Lower Your Risk Next Time
- Start with a low dose, 2.5 to 5 mg of THC for edibles.
- Wait at least 2 hours before taking more.
- Read the label for total THC per serving.
- Keep cannabis away from children and pets.
- Avoid mixing cannabis with alcohol.