For decades the cultural conversation about cannabis in South Africa has swung between criminalisation and casual acceptance. The 2018 Constitutional Court ruling that decriminalised the private use of cannabis by adults changed the legal picture. It did not change the medical one.
Cannabis can be addictive. Modern high-potency strains, daily heavy use, vaping concentrates, and edibles have made the addictive potential more visible than it was a generation ago. At Cherrywood House we now see cannabis presentations regularly, often in younger adults, often alongside other substance use, and often misunderstood by the families around them.
Is Cannabis Really Addictive?
Yes. The clinical evidence is settled. Cannabis Use Disorder is a recognised condition in the DSM-5 and the ICD-11. The major medical bodies, including the World Health Organisation, treat cannabis dependence as a real clinical entity.
What “addictive” means here is the same as for other substances: with regular heavy use, the brain adapts, tolerance develops, withdrawal occurs on cessation, and continued use happens despite consequences. About one in ten people who try cannabis go on to develop a use disorder. The figure rises significantly for daily users and for people who start in adolescence.
The view that cannabis is uniquely safe is not supported by current evidence.
What Has Changed About Cannabis
A few factors have made cannabis dependence more clinically significant than it was a generation ago.
Higher THC Potency
Modern cannabis is far more potent than the cannabis of the 1970s. The THC content of street cannabis has risen substantially over the last decades, and concentrates (oils, waxes, dabs) can reach extreme levels. Higher THC content correlates with higher addiction risk and higher risk of psychiatric complications.
New Routes of Administration
Vaping cannabis concentrates and consuming edibles produce different pharmacological profiles from smoked plant material. Edibles in particular can produce delayed, prolonged, and unpredictable effects that contribute to overuse.
Cannabis as a Daily Routine
In the past, cannabis was often weekend or social use. Daily heavy use, smoking from morning to night, is now common. The clinical picture in daily use is very different from occasional use.
Co-occurrence With Other Substances
Cannabis is rarely the only substance in the picture in people who present for treatment. It frequently sits alongside alcohol, stimulants, or prescription medications.
Signs of Cannabis Use Disorder
The diagnostic picture has clear features. The presence of several of these over the course of a year suggests a use disorder.
Behavioural and Functional
- Using more or for longer than intended. What was meant to be a weekend habit has become daily, then morning-and-evening, then constant.
- Failed attempts to cut down or stop. Genuine intent followed by return to use.
- Time consumed by use. A significant portion of the day is spent using, recovering from use, or planning use.
- Reduced engagement with work, study, hobbies, or relationships.
- Continued use despite problems. Lost jobs, failed exams, relationship breakdowns continue to be insufficient reason to stop.
- Use in hazardous situations. Driving under the influence, working under the influence, parenting while impaired.
Physical
- Tolerance. Needing more to achieve the same effect, or finding the previous amount has less effect.
- Withdrawal symptoms when not using (described below).
- Persistent fatigue, low energy, low motivation.
- Respiratory symptoms in smokers: chronic cough, bronchitis, reduced lung function.
- Disrupted sleep. Initially cannabis may aid sleep; with chronic use, sleep architecture is significantly impaired.
- Reduced appetite outside of use and overeating during use.
Psychological
- Persistent low mood, anxiety, or apathy.
- Cognitive effects: poor concentration, memory problems, reduced motivation, slowed thinking.
- Loss of interest in non-using activities.
- Use to manage emotions rather than for enjoyment.
- Defensive responses to family raising concern.
The Mental Health Picture
The relationship between cannabis and mental health is one of the more important clinical issues in this field.
Anxiety and Depression
Heavy chronic cannabis use is associated with higher rates of anxiety and depression. The relationship runs in both directions: cannabis can worsen pre-existing conditions, and it can contribute to the development of new symptoms with long-term use.
Psychosis Risk
This is the most serious issue. Heavy cannabis use, particularly of high-potency products, particularly starting in adolescence, particularly in people with a personal or family history of psychotic illness, significantly increases the risk of developing psychotic disorders, including schizophrenia. The dose-response relationship is well documented.
This does not mean every heavy cannabis user develops psychosis. It does mean the risk is real and is not equally distributed. Vulnerable individuals face significantly elevated risk.
Amotivational Patterns
Long-term heavy users often develop what clinicians used to call an “amotivational syndrome”: apathy, reduced engagement, loss of ambition, drift. Whether this is a direct effect of cannabis on the brain or a behavioural pattern from chronic use is debated. Either way, it is a recognisable clinical picture.
Cognitive Effects in Adolescence
Cannabis use that begins in adolescence has measurable effects on cognitive development, particularly when use is heavy and sustained. Some of these effects may not fully reverse.
Cannabis Withdrawal
Cannabis withdrawal is real and recognised. It is not as physically dramatic as alcohol or opioid withdrawal, but it is significant.
Typical Timeline
- Days 1-3: Onset of symptoms.
- Days 3-7: Peak severity for most symptoms.
- Weeks 2-4: Most acute symptoms resolve.
- Months 1-3: Residual sleep disturbance and low mood may persist.
Common Symptoms
- Irritability and anger
- Anxiety
- Disturbed sleep, often severe insomnia and vivid dreams
- Reduced appetite
- Restlessness
- Depressed mood
- Headache, sweating, abdominal pain
Cannabis withdrawal is not directly medically dangerous, but it can be unpleasant enough to derail attempts to stop, particularly when sleep disturbance becomes severe.
Treatment at Cherrywood House
Cannabis Use Disorder is treated within our residential addiction programme. Cannabis is rarely the only issue, so the assessment looks at the whole picture.
Assessment
The intake clinical assessment establishes the duration and pattern of use, mental health history, family history, and other substance use. We also assess for the cognitive and psychiatric effects of heavy long-term use, which sometimes require dedicated work.
Detox Phase
Although cannabis withdrawal does not require the medical supervision that alcohol or benzodiazepine withdrawal does, the residential setting makes it significantly easier. We address sleep disturbance, anxiety, and mood symptoms with appropriate non-addictive medication where indicated.
Therapeutic Programme
CBT, motivational interviewing, group therapy, and where appropriate trauma-focused work, are integrated as in our other programmes. The work focuses on:
- Identifying the function of cannabis in the person’s life (sleep aid, anxiety management, social lubricant, identity).
- Building alternative ways to meet those needs.
- Addressing the co-occurring conditions (depression, anxiety) that often surface once the substance is removed.
- Lifestyle reconstruction: sleep hygiene, exercise, structured days.
Aftercare
The aftercare phase is where cannabis recovery often most needs support. Cannabis is widely available, socially accepted in many circles, and often deeply embedded in the person’s friend group. Aftercare addresses the relational and lifestyle changes that make long-term cessation sustainable.
FAQ: Cannabis Addiction
Is cannabis addiction worse than alcohol addiction?
Different. Cannabis withdrawal is less physically severe, but the psychological grip, the lifestyle integration, and the mental health risks can be substantial. Each is its own clinical picture.
Is medical cannabis still a problem if it is prescribed?
Medical cannabis used appropriately for a defined medical condition is a different scenario from recreational use. Even with a prescription, dependence can develop with daily high-dose use. The clinical question is whether use has become problematic, not whether it is technically legal.
Does cannabis cause schizophrenia?
Cannabis does not cause schizophrenia in everyone. It significantly increases the risk in vulnerable individuals, particularly with heavy use starting in adolescence. The risk is real and well documented.
Can my child be in cannabis recovery and still socialise normally?
Yes, but the social environment often needs to change. Where the friend group is built around daily use, recovery typically involves rebuilding social connections that do not centre on the substance.
How long does it take for cognitive function to return after stopping cannabis?
Many cognitive effects improve significantly within weeks to months of cessation. Some effects, particularly those acquired through heavy adolescent use, may take longer or be partial in recovery. Most people experience marked improvement.
Will Cherrywood House treat someone who is using cannabis along with other substances?
Yes. Polysubstance presentations are common and well within our scope.
If cannabis use has stopped looking recreational and started looking compulsive, Cherrywood House provides specialist residential treatment in Cape Town. Call +27 79 714 1966 or email info@cherrywoodhouse.com for a confidential conversation.
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