Short answer
If you smoke too much cannabis, you can get a short, uncomfortable high with anxiety, panic, fast heartbeat, nausea, confusion, dry mouth, red eyes, and poor coordination. The exact result depends on THC potency, dose, tolerance, body weight, and whether you also used alcohol or other drugs. A large dose can lead to vomiting, chest discomfort, fainting, or a panic reaction that feels like a medical emergency. Cannabis overdose is seldom fatal, but it can be very unpleasant and sometimes needs medical care. If symptoms are severe or you are worried, call 911 or Poison Control at 1-800-222-1222.
Can You Die from Smoking Too Much Weed?
What you may feel right away
- Fast or pounding heartbeat
- Anxiety, panic, or a sense of doom
- Nausea or vomiting
- Confusion or trouble thinking
- Dry mouth and red eyes
- Coughing or throat irritation
- Poor balance and slow reaction time
Why high-potency products raise the risk
Convenience formats such as vape carts, pre-rolls, and packaged edibles make it easy to take more THC than intended. Vaping delivers a large dose fast. Edibles can hit after 30 to 120 minutes, so a second serving can stack on the first. High-THC products raise the chance of anxiety, panic, and nausea, mainly for people with low tolerance. People call a bad reaction a green out.
marijuana toxicity level lethal dose
When to get medical help
- Call 911 if the person has trouble breathing, chest pain, fainting, seizures, or severe confusion.
- Call Poison Control at 1-800-222-1222 if you took an edible or concentrate and symptoms feel intense or unusual.
- Keep the person seated or on their side if they vomit.
- Stay with the person until help arrives or symptoms ease.
- Do not give more cannabis, alcohol, or stimulants to calm the reaction.
What to do next
- Stop smoking or vaping cannabis for the rest of the day.
- Move to a quiet room with dim light.
- Sip water if your mouth is dry.
- Take slow breaths.
- Focus on a fixed point.
- Do not drive, bike, or operate machinery.
- Ask a friend to stay with you if you feel panicked.
Heavy use over time
Daily high-dose use can lead to tolerance, dependence, and withdrawal symptoms such as irritability, poor sleep, and low appetite. Some heavy users develop cannabinoid hyperemesis syndrome, with repeated vomiting and abdominal pain that hot showers may ease for a short time. That pattern needs medical care. Heavy use also can worsen anxiety and depression in people who are vulnerable, and it can impair memory and attention.
How to lower your risk
- Start with a low dose, with edibles or concentrates.
- Wait at least two hours before taking more edible cannabis.
- Check THC content on the label before you use.
- Avoid mixing cannabis with alcohol or other drugs.
- Skip cannabis if you have heart disease or a personal history of psychosis.