What a green out is
A green out is acute THC overconsumption. THC binds CB1 receptors in the brain and nervous system. A dose that is too high for one person triggers a cluster of physical and mental symptoms. The term comes from the pale, greenish skin color that can appear with nausea and low blood pressure.
Tolerance, body weight, dose, and delivery method all shift where that line sits. The same edible that feels mild to one person can send another to the bathroom floor.
Understanding the Symptoms of the Cannabis High
Common green out symptoms
- Nausea and vomiting
- Dizziness and lightheadedness
- Resting heart rate above 100 beats per minute
- Sweating, chills, and clammy skin
- Anxiety, panic, and a sense of losing control
- Confusion, slowed speech, and trouble tracking a conversation
- Headache, dry mouth, and red eyes
- Low blood pressure with fainting in some cases
Timeline
Inhaled THC reaches the bloodstream in seconds. Effects peak 10 to 30 minutes after a hit and fade over 2 to 3 hours. Edibles take 30 to 120 minutes to start. Peak plasma levels land 2 to 4 hours after swallowing, and effects can hold for 6 to 8 hours. High-dose edibles can stretch past 12 hours.
Signs of Cannabis Toxicity: Symptoms and When to Call 911
That delay is the main trap. People eat a second serving at the 40-minute mark because the first one has not hit yet.
How serious it is
No fatal overdose from cannabis alone has been confirmed in a healthy adult. Emergency department visits tied to THC edibles rose in states after legal sales started. Poison center calls for edible exposures draw more medical attention than inhaled exposures.
Call 911 for chest pain, breathing trouble, vomiting that lasts more than one hour, or a loss of consciousness.
What helps during a green out
- Stop dosing. Do not take more THC.
- Sit or lie down. Keep the head above the heart if you feel faint.
- Drink water in small sips. Skip alcohol and caffeine.
- Move to a quiet, dim room. Lower noise and light.
- Wait. Most episodes resolve in 1 to 4 hours without treatment.
Chewing black pepper or smelling citrus peel is a common home remedy. Evidence for it is anecdotal. No controlled trial has tested it.
CBD and THC
CBD acts as a negative allosteric modulator at CB1. It changes the shape of the receptor and can blunt some THC effects. Small human studies show CBD doses of 200 to 400 mg given before or with THC reduce anxiety, heart rate, and memory impairment in some subjects. Results vary, and timing matters. A 1:1 CBD to THC ratio is a common starting point for people who are sensitive to THC.
Risk factors
- First use or a long break from use
- Edibles, tinctures, and concentrates
- Doses above 10 mg THC in one serving
- Alcohol or prescription sedatives
- Empty stomach