If cannabis is part of your anxiety, low mood, poor sleep, or a hard-to-stop pattern, the short answer is that people often use it hoping to feel calmer, but the research does not give one simple answer. THC can change mood, thinking, and perception; for some people it can also bring on anxiety, fear, panic, or paranoia, while anxiety itself may lead some people to use cannabis for relief.
Get urgent help now for severe vomiting, confusion, hallucinations, chest pain, trouble breathing, a very fast heartbeat, or thoughts of suicide or self-harm. Call, text, or chat 988 for 24/7 crisis support, and call 911 in an emergency. Withdrawal from alcohol, opioids, and benzodiazepines can be dangerous and needs medical care.
Can cannabis help anxiety or depression?
Many people reach for cannabis because anxiety feels relentless, sleep feels out of reach, or their mood feels flat. A 2024 critical review in Cannabis and Anxiety found a real association between anxiety and cannabis use, but the direction is not settled. Its review of 15 studies found an association between anxiety and cannabis use, and 13 studies found a stronger association with cannabis use disorder; it concluded that self-medication is a leading explanation for why the two often appear together.
That matters because relief in the moment and improvement of an anxiety disorder are not the same question. The National Center for Complementary and Integrative Health describes only a small amount of human evidence for anxiety: one study of 24 people with social anxiety disorder found less anxiety during a simulated public-speaking test after CBD than placebo. Four studies also suggested possible benefit for anxiety in people with chronic pain, not necessarily anxiety disorders. That is a narrow starting point, not a general answer for anxiety or depression.
For depression, the CDC says cannabis use has been linked with depression, social anxiety, and schizophrenia, while scientists do not yet fully understand these relationships. The 2023 BMJ umbrella review brought together 101 meta-analyses and found suggestive-to-highly-suggestive harmful associations for outcomes including depression and mania, while randomized-trial findings differed by condition and product. If your worry or low mood is running your day, start with the practical question of getting support for the problem itself. Our guide to managing anxiety can help you put that conversation into words.
Why can weed feel calming one time and make anxiety worse another time?
Your brain has an endocannabinoid system: a signaling system involved in functions including mood, memory, stress response, and sleep. Cannabis compounds act on parts of that system. THC is the intoxicating compound that produces the high; it can temporarily alter mood, thoughts, and perceptions. CBD does not cause a high, but it is not the same as an FDA-approved anxiety treatment.
Context and product strength matter. NIDA says anxiety, fear, distrust, panic, and hallucinations are more common when a person takes a large amount, uses a strong THC product, or has little experience with cannabis. NIDA also reports that THC potency in seized illegal products rose from 3.96% in 1995 to 16.14% in 2022, and dispensary flower and concentrates can exceed 40% THC. This helps explain why “weed” is not one consistent experience.
A Johns Hopkins study of 20 healthy adults, median age 26, tested vaporized THC, d-limonene, both together, or placebo across up to 10 outpatient sessions. The researchers found lower participant ratings of feeling anxious, nervous, and paranoid with THC plus d-limonene than with THC alone. It is an interesting, small human study, not a reason to use a terpene or cannabis product for anxiety.
When does cannabis use become a cannabis use disorder?
Cannabis use disorder is not a moral label. NIDA describes it as a pattern that causes clinically significant distress or impairment. Signs can include using more or longer than intended, unsuccessful efforts to cut down, cravings, spending a lot of time around use or recovery, problems at work, school, home, or relationships, giving up important activities, continued use despite problems, tolerance, or withdrawal.
The CDC says about 3 in 10 people who report cannabis use have cannabis use disorder, and risk is stronger with more frequent use or when use begins in youth. A 2020 systematic review and meta-analysis of 21 studies found that 22% of people who used cannabis met criteria for cannabis use disorder; its estimate for young people with regular weekly or daily use was 33%, although the review noted limits in available cohort data.
Withdrawal can feel a lot like the very problem a person was trying to manage: anxiety, irritability, restlessness, low mood, insomnia, unsettling dreams, reduced appetite, headaches, sweating, stomach pain, or tremor. A 2020 JAMA Network Open meta-analysis included 47 studies and 23,518 participants with regular or dependent cannabinoid use; its pooled withdrawal estimate was 47%, with very different rates across population, outpatient, and inpatient samples. Experience varies.
Do not set your own taper schedule or change a prescribed medicine on your own. A clinician can look at cannabis use, mental health symptoms, other substances, medicines, and safety needs together. NIDA says behavioral approaches such as cognitive behavioral therapy, motivational enhancement therapy, and contingency management can be effective for cannabis use disorder; there is no FDA-approved medication for cannabis use disorder or medically assisted cannabis withdrawal. A 2025 Cochrane review of 37 randomized trials involving 3,201 participants likewise found the medication evidence incomplete.
Could repeated vomiting be cannabinoid hyperemesis syndrome?
It could be, and it deserves medical attention. NIDA describes cannabinoid hyperemesis syndrome (CHS) as nausea, vomiting, and abdominal pain after long-term, heavy cannabis use. It can recur. People may notice temporary relief from hot showers or baths, but NIDA says CHS resolves only when a person stops cannabis completely.
| Question | What the research says |
|---|---|
| What are the symptoms? | Repeated or cyclic nausea and vomiting, abdominal pain, and sometimes temporary relief with hot bathing are the key documented features. |
| How do I tell if it may be CHS? | A 2017 systematic review found regular cannabis use, cyclic vomiting, symptom resolution after stopping, hot-bath relief, abdominal pain, and at least weekly use were common characteristics. A clinician needs to sort out other causes of vomiting and pain. |
| What are the three stages? | The sources provided here do not set out a three-stage model. Focus on the symptoms and seek medical evaluation rather than trying to stage it yourself. |
| How many people have died from CHS? | The sources provided here do not give a CHS death count. Severe or ongoing vomiting needs urgent medical assessment. |
| Can I smoke again? Does it fully go away? | NIDA says CHS can recur and resolves only with complete cessation. That makes returning to cannabis a question to take to a clinician, especially after vomiting episodes. |
A 2017 systematic review of 183 reports found symptom resolution after stopping cannabis in 96.8% of the cumulative cases it assessed; it also notes that CHS research has important limits and that its underlying biology remains unclear. Go to urgent care or call 911 for severe vomiting, chest pain, trouble breathing, confusion, hallucinations, or a very fast heartbeat.
What should you do next if cannabis and mental health are tangled together?
You do not have to decide whether cannabis “caused” every symptom before asking for help. Bring a clear list to a clinician: what you use, any changes in anxiety, mood, sleep, vomiting, panic, or thinking, other substances, and all medicines. This is especially important if you have had hallucinations, psychotic symptoms, severe anxiety, or a history of bipolar disorder. For a wider map of anxiety, depression, and related conditions, see common mental health disorders.
For confidential help finding local care, SAMHSA’s National Helpline is 1-800-662-HELP (4357), free and confidential, 24/7, in English and Spanish. You can text 435748 or use FindTreatment.gov. A person you care about can use those options too. Cannabis laws differ by state and change, so check current law where you live.
Before you make a next move
- Get urgent help for severe vomiting, confusion, hallucinations, chest pain, trouble breathing, a very fast heartbeat, or thoughts of suicide or self-harm: call, text, or chat 988; call 911 for an emergency.
- Tell a clinician if withdrawal, anxiety, low mood, sleep problems, or vomiting are part of the picture; do not adjust prescribed medicines on your own.
- If alcohol, opioids, or benzodiazepines are also involved, seek medical care before trying to stop because withdrawal can be dangerous.
- Use SAMHSA’s National Helpline, 1-800-662-HELP (4357), or SAMHSA support to find the next appropriate step.
By GlobalMHSummit.com Research Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.