Cannabis-induced psychosis: the short answer
Cannabis-induced psychosis is a psychotic episode that starts during or soon after cannabis use. Symptoms include hallucinations, delusions, paranoia, and disorganized speech. The DSM-5 lists it as a substance/medication-induced psychotic disorder. Most episodes ease within hours to days after the drug clears the body. Some last weeks. THC is the compound tied to psychosis. CBD is not.
Symptoms
- Hearing voices or sounds other people do not hear.
- Fixed beliefs that do not match facts, such as being watched or followed.
- Paranoia and fear that others mean harm.
- Speech that jumps between topics and does not track.
- Agitation, confusion, and trouble sleeping.
Timing matters. Symptoms start within minutes of smoking or vaping. With edibles, effects start 30 to 90 minutes after eating. A fast heart rate, sweating, and dilated pupils can come first.
Cannabis-Induced Mental Disorders: Symptoms, Risks, and CBD Research
Risk factors
Potency is one factor. NIDA data show average THC in seized US cannabis rose from about 4 percent in 1995 to more than 14 percent in 2019. A 2019 study in The Lancet Psychiatry found daily use of high-potency cannabis, defined as THC above 10 percent, accounted for about 30 percent of first-episode psychosis cases in London and 50 percent in Amsterdam.
Other factors:
- Daily or near-daily use
- First use before age 15
- Personal or family history of psychosis, schizophrenia, or bipolar disorder
- Use of stimulants such as cocaine or amphetamines
- Sleep loss
Most people who use cannabis do not develop psychosis. Danish registry data link cannabis use disorder to a higher rate of schizophrenia. One 2023 analysis in Psychological Medicine estimated about 15 percent of schizophrenia cases in Denmark could be attributed to cannabis use disorder.
How it differs from schizophrenia
Cannabis-induced psychosis clears with abstinence and short-term care. Schizophrenia requires symptoms for at least 6 months. Some people who have one cannabis-induced episode later develop a schizophrenia spectrum disorder. Risk rises with repeat episodes and with early age at first use. At the first episode, a clinician often cannot tell the two apart. Follow-up and abstinence are how the difference gets sorted out.
What to do during an episode
- Stop all cannabis use. That includes flower, vapes, edibles, and concentrates.
- Move the person to a calm, quiet room. Lower lights and noise.
- Do not argue about delusions or hallucinations. Speak in short sentences.
- Call 911 if there is risk of harm to self or others, or if the person cannot be kept safe.
- Call or text 988 for the Suicide & Crisis Lifeline in the US.
- Get a medical exam. Clinicians rule out infection, thyroid problems, and stimulant use.
- Short-term antipsychotics or benzodiazepines may be given for severe agitation.
Does CBD help?
No CBD product is FDA-approved to treat psychosis. Epidiolex, a prescription CBD, is approved for certain seizures. One 2018 trial found 1000 mg of CBD per day reduced positive symptoms in people with schizophrenia. A later, larger trial did not repeat that result. There is no evidence that over-the-counter CBD prevents or treats cannabis-induced psychosis. CBD also acts on CYP450 enzymes and can raise blood levels of some antipsychotics. Tell your prescriber about any CBD you take.
Bottom line
Cannabis-induced psychosis is a medical event, not a mood. Stop THC, get assessed, and follow up with a clinician. CBD is not a treatment for it.