Cannabis Use Disorder (CUD) – Complete Guide
Cannabis is one of the most widely used psychoactive substances in the world. While many people believe cannabis is “relatively harmless,” research shows that approximately one in three users will develop a dependency problem at some point in their lives – a rate similar to alcohol dependence. Cannabis Use Disorder (CUD) is a formally recognised mental health diagnosis characterised by continued use despite significant impairment.
What is Cannabis Use Disorder?
Cannabis Use Disorder is defined as a problematic pattern of cannabis use leading to clinically significant impairment or distress. According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5-TR), a diagnosis requires at least 2 of 11 criteria within a 12-month period.
DSM-5 Diagnostic Criteria Cover Four Domains:
| Domain | Specific Criteria |
|---|---|
| Impaired Control | Using more than intended, unsuccessful attempts to quit, excessive time obtaining/using/recovering, intense cravings |
| Social Impairment | Failure to fulfil work/school/home obligations, interpersonal problems, giving up important activities |
| Risky Use | Using in dangerous situations (e.g., driving), continued use despite known harm |
| Pharmacological Indicators | Tolerance (needing more for the same effect), withdrawal symptoms |
Severity Levels:
Mild: 2-3 criteria met
Moderate: 4-5 criteria met
Severe: 6 or more criteria met
How Common is Cannabis Use Disorder?
According to data released by the UK Office for National Statistics in December 2025, approximately 2.2 million adults in England and Wales (6.5% of the 16-59 population) reported using cannabis. More concerning, the number reporting signs of cannabis dependence rose from 2.8% in 2014 to 4.3% in 2024.
Treatment Data Reveals the Reality:
One in five adults starting treatment in 2024-2025 had a cannabis problem
Cannabis is the most common substance for which children and young people receive treatment, accounting for 86% of cases
In secure settings (such as prisons), 93% of young people report cannabis problems
Dr Lade Smith, President of the Royal College of Psychiatrists, stated: “Cannabis is the most widely used illicit substance in the UK, and around one in three users will develop a dependency problem at some point in their lives.”
Symptoms and Signs of Cannabis Use Disorder
Symptoms of CUD may develop gradually, and many people do not realise they have a problem initially. Dr Beverly Shin of Weill Cornell Medicine suggests asking yourself the following questions:
Am I functioning at work or school as well as I’d like?
Am I engaging with loved ones as much as I’d like?
Am I enjoying life?
Am I doing the things that matter to me?
“If the answer to any of those is no, and cannabis is causing you to miss out on life or not feel well, it’s worth considering whether you might have cannabis use disorder.”
Common Symptoms Include:
Trying to quit but failing
Experiencing strong cravings for cannabis
Developing withdrawal symptoms when trying to stop
Building tolerance, needing more to achieve the same effect
Spending a lot of time using cannabis
Choosing cannabis over activities you once enjoyed
Cannabis Withdrawal Symptoms typically begin within 24-72 hours after stopping and last 1-2 weeks:
Irritability and anger
Insomnia and sleep disturbances
Decreased appetite and weight loss
Anxiety and restlessness
Depressed mood
Intense cravings
Long-Term Health Risks
Chronic, frequent cannabis use is associated with numerous health problems:
Cognitive Function:
Chronic heavy use impairs attention, memory, and executive function. Hippocampal atrophy and cortical thinning have been observed in long-term users. Adolescent use may cause IQ decline that does not recover.
Mental Health:
Daily cannabis use is linked to depression, anxiety, and decreased motivation. Most seriously, cannabis use may increase the risk of developing psychotic disorders by up to 5 times in vulnerable individuals, with adolescents particularly at risk.
Cardiovascular Health:
Cannabis use is associated with increased risk of myocardial infarction, stroke, and arrhythmias.
Respiratory System:
Smoking cannabis causes chronic bronchitic symptoms and airflow obstruction, independent of tobacco use.
Other Risks:
Impaired driving ability, increasing accident risk
Reduced educational and occupational achievement
Cannabinoid hyperemesis syndrome (cyclical vomiting relieved by hot showers)
Treatment Options and Interventions
There is currently no FDA-approved medication for cannabis use disorder. Treatment relies primarily on psychosocial interventions.
Psychosocial Treatments (First-Line)
Cognitive Behavioural Therapy (CBT) is the most widely used treatment approach. It helps patients identify and challenge thought patterns and behaviours that lead to cannabis use, teaching coping skills for cravings and triggers.
Motivational Enhancement Therapy (MET) enhances intrinsic motivation through personalised feedback and goal-setting, supporting sustained behaviour change.
Mindfulness-Based Relapse Prevention (MBRP) helps patients develop awareness of triggers and cravings without reacting impulsively.
Current State of Pharmacological Research
An updated Cochrane systematic review published in 2025 included 37 randomised controlled trials (3,201 participants) evaluating various medications. Results showed:
THC preparations: No significant difference in abstinence at end of treatment compared to placebo (RR 1.04, 95% CI 0.71-1.52)
N-acetylcysteine: Also showed no significant advantage (RR 1.17, 95% CI 0.73-1.88)
Cannabidiol (CBD): Evidence quality was low, with uncertain results (RR 2.23, 95% CI 0.54-9.32)
Regarding adverse effects, THC preparations, CBD, and N-acetylcysteine showed no significant difference in adverse event rates compared to placebo.
Frequently Asked Questions
How common is cannabis use disorder?
Approximately 10% of people who use cannabis will develop cannabis use disorder, with higher risk for those who start before age 18. Around one in three users will develop a dependency problem at some point in their lives.
Is cannabis withdrawal dangerous?
Cannabis withdrawal is not life-threatening but can be highly uncomfortable and is a common trigger for relapse. Symptoms typically begin within 24-72 hours and last 1-2 weeks.
Can cannabis use disorder be cured?
CUD is chronic but can go into remission with sustained treatment and psychosocial support. Early intervention, high THC exposure, and untreated psychiatric disorders predict a more persistent or severe course.
Can CBD treat cannabis use disorder?
CBD’s potential as a treatment for CUD is being researched, but current evidence quality is low, and its effectiveness cannot yet be confirmed.
What are the special risks of synthetic cannabinoids?
Synthetic cannabinoids (such as K2/Spice) are potent CB1 and CB2 receptor agonists that can cause severe and unpredictable toxicity, including agitation, psychosis, seizures, acute kidney injury, myocardial infarction, and even death.
Cannabis Use Disorder is a real and treatable health condition affecting hundreds of thousands of people across the UK. Despite the common belief that cannabis is “not addictive,” data shows that around one in three users will develop a dependency problem – a rate comparable to alcohol dependence.
If you or someone you know is struggling with cannabis use, seeking professional help is an important first step. Psychosocial interventions including cognitive behavioural therapy, motivational enhancement therapy, and mindfulness-based relapse prevention have been shown to be effective. While no approved medications currently exist, research continues.