Can weed cause anxiety and psychosis?
Marijuana side effects and withdrawal symptoms

If you smoke weed, vape THC, use dabs, or eat edibles, you have probably heard that marijuana is harmless. Many people use it to relax or to take the edge off anxiety. But the cannabis sold today is far stronger than it was twenty years ago, and the research is clear that it can cause anxiety, panic attacks, withdrawal symptoms, and psychosis, especially with frequent use and high-THC products. Here is what to know.

Side effects of weed: what happens when you get high

THC is the part of cannabis that produces the high. Its effects depend on the dose, the strength of the product, how you take it, and how used to it your body is.

Mind and mood

• Anxiety, fear, suspicion of others, restlessness, and irritability
• Panic attacks and paranoia, more likely at higher doses
• Trouble with short-term memory, focus, and coordination
• Less commonly, hallucinations, strange beliefs, or losing touch with reality

Body

• Racing heart and irregular heart rhythms, including atrial fibrillation
• Dizziness or feeling faint on standing
• Dry mouth, red eyes, slurred speech
• Cough, wheezing, and worse asthma from smoking or vaping

A pounding heart and dizziness can feel like a heart attack, and that fear can set off more panic. It is one reason a bad high can spiral quickly.

Does weed cause anxiety?

It can, in three different ways.

1. Anxiety and panic while high. Anxiety, panic, and suspiciousness are more common with high-THC products, after a large amount, and in people with little experience. Cannabis can also trigger a short-lived cannabis-induced anxiety disorder.
2. Higher-potency weed, more anxiety. In one analysis, people using cannabis with 10 percent THC or more had a higher rate of generalized anxiety disorder than people using weaker products: about 19 percent versus 12 percent.
3. Anxiety when you cut back or stop. This is the one most people miss. Anxiety is among the most common withdrawal symptoms. Many people feel anxious after stopping, conclude that weed was treating their anxiety, and start again. Clinicians are specifically advised not to mistake withdrawal for an anxiety disorder, because that mistake keeps the cycle going.

Is the link proven? Short-term anxiety and panic from THC are well documented. Whether long-term use causes a lasting anxiety disorder is less settled, and the research is mixed. Cannabis use is also linked to poorer outcomes when mood and anxiety disorders are treated.

Weed withdrawal symptoms

Withdrawal can occur when someone who uses often or heavily stops suddenly or cuts way down. Close to half of daily users get some withdrawal symptoms.

Common symptoms (mind and mood)

• Anxiety or nervousness
• Irritability, anger, or aggression
• Restlessness
• Trouble sleeping, including vivid or strange dreams
• Low or depressed mood
• Loss of appetite or weight loss

Physical symptoms (less common)

• Stomach pain or cramps
• Shakiness or tremor
• Sweating or night sweats
• Chills or low-grade fever
• Headaches
• Muscle aches

How long does weed withdrawal last?

• Starts: one to two days after stopping
• Peaks: days two to six
• Lasts: usually a few weeks; three weeks or longer in heavy users

The American Heart Association describes a somewhat longer course, with symptoms peaking around day ten and ending around day thirty. Withdrawal tends to be worse with more frequent, longer, and higher-potency use.

Why it matters: withdrawal is usually mild and passes on its own, but it is one of the main reasons people go back to using. Tapering down slowly may soften it. Get medical help right away if withdrawal brings on thoughts of suicide or makes an existing mental health condition worse.

Can weed cause psychosis? What the research shows

Yes. Psychosis means losing touch with reality: hearing voices, seeing things that are not there, or feeling certain that people are watching you or out to get you. Cannabis is linked to psychosis at three levels.

1. Short-term psychosis while high. Laboratory studies show that THC can produce a brief psychotic state, usually lasting a few hours. CBD does not. Depending on how the question is asked, 5 to 50 percent of adults report brief psychotic symptoms while high.
2. Cannabis-induced psychosis. Sometimes the psychosis lasts days to weeks after the high wears off and needs medical treatment. It usually improves after stopping, but it often returns with further use.
3. A higher risk of schizophrenia and bipolar disorder. Up to half of people diagnosed with cannabis-induced psychosis are diagnosed years later with schizophrenia or bipolar disorder. National registry studies find that one-fifth to one-half go on to develop a long-term psychotic disorder that looks the same as schizophrenia, more often in those who started as teens or use high-THC products. A 2026 meta-analysis estimated that about one in five people with cannabis-induced psychosis later develop a schizophrenia-spectrum disorder, and about one in twenty develop bipolar disorder.

How often and how strong matters

• Risk rises with frequency: about 35 percent higher with weekly use and 76 percent higher with daily use, compared with no use.
• People who use cannabis have a two- to four-fold higher risk of psychosis than people who never use.
• Frequent use or high-THC use has been linked to roughly a six-fold higher risk of schizophrenia.

Who is most at risk

• Teens and young adults. A 2024 long-term study found an eleven-fold higher risk of psychotic disorders tied to cannabis use in the teen years. Starting young is linked to earlier onset, more severe symptoms, and more relapses.
• Family history. Risk is higher if a close relative has schizophrenia or another psychotic disorder.
• An existing psychotic disorder. Cannabis is linked to more relapses, worse symptoms, and more hospital stays.

Is it proven that weed causes psychosis? Laboratory studies give strong evidence that THC causes short-term psychosis. For schizophrenia, the evidence comes from long-term studies of large groups, in which cannabis use came before the psychosis even after accounting for alcohol and other drugs. Researchers still debate how much is direct cause and how much is shared risk or people using weed to cope with early symptoms. Most people who use cannabis never develop schizophrenia, but cannabis appears able to set off lasting psychosis in people who are vulnerable.

Cannabis psychosis symptoms: warning signs

Get help if you or a friend notice any of these during or after using weed:

• Hearing voices or seeing things others do not
• Strong paranoia, or feeling followed, watched, or targeted
• Beliefs that make no sense to the people around you
• Confused, jumbled thinking or speech
• Pulling away from friends and family, or acting very differently
• Symptoms that do not fade after the high wears off

More long-term side effects of weed

• Addiction (cannabis use disorder): about three in ten people who use cannabis develop it. Risk rises with daily use, starting young, and high-THC products.
• Depression and suicidal thoughts: long-term use is linked to a higher risk of depression and of suicidal thoughts and behavior.
• Memory and thinking: problems with learning, memory, attention, and processing speed. In adults, some of this improves after about twenty-five days without cannabis.
• Heart and stroke: higher risk of stroke, heart attack, and irregular heartbeat. Daily use is linked to more coronary heart disease and stroke than occasional use.
• Lungs: cough, wheezing, phlegm, and chronic bronchitis from smoking or vaping.
• Stomach: repeated severe vomiting (cannabinoid hyperemesis syndrome), acid reflux, pancreatitis, and ulcers.
• Cancer: higher risk of head, neck, and throat cancers, especially in people who smoke it.
• Driving and injuries: more car crashes and workplace injuries.
• Contaminants: some products contain mold, heavy metals, or pesticides.
• Pregnancy: linked to low birth weight, smaller babies, and more newborn intensive-care stays.

How to lower your risk if you use weed

• Use less often, and avoid daily use.
• Choose lower-THC products. Skip dabs, concentrates, and high-THC carts.
• Go slow with edibles. Wait at least two to three hours before taking more.
• Wait until your mid-twenties, or do not use, to protect a developing brain.
• Do not use at all if you have a family history of psychosis, a psychotic or bipolar disorder, or are pregnant.
• If you use heavily, taper down instead of stopping all at once, to ease withdrawal.
• Stop and get help if you notice paranoia, voices, or confused thinking.

How to quit weed: help is available

Cannabis use disorder and withdrawal are treatable. Counseling and cognitive behavioral therapy are the main treatments, and a psychiatric provider can treat the anxiety, depression, or sleep problems that often sit underneath heavy use. The SAMHSA National Helpline at 1-800-662-4357 is free, confidential, and open around the clock in English and Spanish. If someone is in crisis or having thoughts of suicide, call or text 988.

Frequently Asked Questions

Does weed cause anxiety?

It can. THC can cause anxiety and panic attacks, especially with high-THC products, large doses, or little experience. Anxiety is also one of the most common weed withdrawal symptoms.

Why do I get anxious when I stop smoking weed?

That is most likely withdrawal. Anxiety, irritability, restlessness, and trouble sleeping usually start one to two days after stopping and peak around days two to six.

How long does weed withdrawal last?

Usually a few weeks. Some heavy users have symptoms for three weeks or longer.

Can weed cause panic attacks?

Yes, especially at higher doses. The racing heart THC produces can make panic worse.

Can weed cause psychosis the first time you use it?

Yes. A large dose of high-THC cannabis can cause short-term paranoia or hallucinations even in a first-time user.

How long does weed-induced psychosis last?

Short episodes last hours. Cannabis-induced psychosis can last days to weeks and usually improves after stopping, but it often comes back with further use.

Does marijuana cause schizophrenia?

Frequent and high-THC use, especially in the teen years, is linked to a higher risk. About one in five people with cannabis-induced psychosis later develop a schizophrenia-spectrum disorder.

Are THC vapes and dabs riskier than flower?

Higher-potency products are linked to more psychotic experiences and more anxiety than lower-potency cannabis.

Is CBD the same as THC?

No. The psychosis risk described here is linked to THC. CBD does not produce the brief psychotic state seen with THC.

Is weed addictive?

Yes. About three in ten people who use cannabis develop cannabis use disorder.

See also: Cannabis for anxiety: calm or trap? · Marijuana and ADHD focus · Mixing weed with ADHD medication · Anxiety attack versus panic attack · Schizophrenia: a guide for patients and families · Anxiety treatment