Is dagga legal in South Africa?

Is marijuana legal in SA? The short answer is: not exactly. Dagga (cannabis) has been partially decriminalised in South Africa, but it hasn’t been legalised. The distinction matters, both legally and for public health.

This article explains where the law currently stands, what the research says about the health effects of cannabis, and when regular use crosses into addiction.

What does South African law say about cannabis?

In 2018, the Constitutional Court ruled that the prohibition on the private use, possession, and cultivation of cannabis by adults in private was unconstitutional. This effectively decriminalised cannabis for personal use at home. Adults can use, possess, and grow cannabis in private without being prosecuted.

What the 2018 ruling didn’t do was legalise cannabis. There’s no legal framework for commercial sale or supply. Buying, selling, and dealing in cannabis remains illegal. Using cannabis in public remains illegal. Supplying it to anyone, including another adult, remains illegal.

The 2024 Cannabis for Private Purposes Act gave formal legal effect to the 2018 ruling, but this is a personal-use framework only. Adults may possess up to 750 grams of dried cannabis in a private place for personal use. The 750g limit applies to harvested cannabis, even if it is not yet fully dried, and the definition of a “private place” in this context is any building, dwelling, or land to which the public does not have free access. This excludes public spaces, work environments, and school premises. 

Penalties for possession still apply in many circumstances. If you’re found with cannabis in a public place, prosecution is still possible. For anyone under 18, cannabis remains fully illegal.

What does cannabis do to your body?

Cannabis contains hundreds of compounds. The main psychoactive ingredient is tetrahydrocannabinol (THC), which binds to cannabinoid receptors in the brain and alters mood, perception, memory, and coordination.

Short-term effects include:

• A sense of relaxation and mild euphoria
• Altered time perception
• Increased appetite
• Impaired memory and concentration
• Increased heart rate
• In some people: anxiety, panic, or paranoia

The experience varies significantly depending on the potency of the cannabis, the amount used, the method of use, and the individual. First-time users, people who use high-THC products, and people with a predisposition to anxiety are more likely to have a negative reaction.

How long does cannabis stay in your system?

THC is fat-soluble, which means it’s stored in body fat and released gradually over time. Cannabis stays detectable for longer than most other substances, and the window varies considerably depending on how frequently someone uses.

Typical detection windows:

• Urine test: 3–4 days for occasional users; up to 30 days or more for daily users
• Blood test: 1–2 days for occasional users; up to a week for heavy users
• Saliva test: 24–72 hours
• Hair follicle test: up to 90 days

For regular or heavy users, cannabis can remain detectable in urine for four to six weeks after stopping. This has practical implications for employment drug testing, legal matters, and medical assessments.

Long-term effects of cannabis use

Heavy or long-term cannabis use is associated with a range of health consequences that go beyond the immediate effects.

Mental health is the area of greatest concern. Regular use is associated with increased rates of anxiety and depression, and in genetically predisposed people, it is linked to a higher risk of psychosis and schizophrenia. High-THC products increase this risk. The relationship between cannabis and mental health isn’t simple cause and effect in most cases, but the evidence for harm in heavy users is well established.

Memory and cognition are affected by long-term use, particularly when use begins in adolescence. The adolescent brain is still developing, and regular cannabis exposure during this period is linked to lasting changes in memory, attention, and executive function.

Respiratory health is a concern for people who smoke cannabis, as smoke inhalation causes similar damage to tobacco smoking.

Cannabis use during pregnancy is associated with low birth weight and developmental problems in the child.

Compared to alcohol, the acute toxicity of cannabis is lower: cannabis doesn’t cause fatal overdose in the way that alcohol poisoning can. But the mental health risks of heavy cannabis use, particularly psychosis and dependency, are substantial and often underestimated.

Is cannabis addictive?

Yes. Cannabis use disorder (CUD) is a clinically recognised condition. Research suggests that around 9% of people who use cannabis will develop a dependence, rising to around 17% among those who start in adolescence, and to roughly half of those who use it daily.

Cannabis dependency often develops gradually and isn’t always obvious to the person experiencing it. Regular use becomes habitual. The amount gradually increases as tolerance builds. Stopping becomes difficult, not because of dramatic physical symptoms, but because of the psychological pull and the discomfort of withdrawal.

Cannabis withdrawal symptoms include:

• Irritability and mood swings
• Anxiety and restlessness
• Insomnia and disturbed dreams
• Decreased appetite and weight loss
• Sweating, chills, and headaches
• Strong cravings

Symptoms typically peak within the first week of stopping and ease over two weeks. For heavy long-term users, the psychological symptoms, particularly anxiety, depression, and sleep disruption, can persist for considerably longer.

Signs that cannabis use has become a problem

Not everyone who uses cannabis develops an addiction, but regular use can become problematic without the person realising it. Signs that use has crossed into dependence include:

• Using cannabis daily or near-daily
• Finding it difficult to get through the day without using
• Using more than intended, or struggling to cut down despite wanting to
• Cannabis use is affecting work, study, or relationships
• Continuing to use despite anxiety, paranoia, or low mood that cannabis is making worse
• Spending significant time obtaining, using, or recovering from cannabis
• Withdrawing from activities or people you used to value

Heavy cannabis use is also a known risk factor for escalating to stronger substances, particularly when it’s being used to manage anxiety, depression, or unaddressed trauma. The mechanism isn’t that cannabis is inherently a pharmacological gateway, but that the underlying distress driving the use often isn’t resolved by it, which can push people toward substances with a stronger effect.

Treatment for cannabis addiction at Houghton House

Cannabis addiction is treated as part of Houghton House’s broader drug rehabilitation programme. Because cannabis dependence often involves significant anxiety, depression, or other underlying mental health conditions, treatment addresses both the substance use and the emotional drivers behind it.

Treatment typically includes:

• Psychiatric assessment and ongoing psychiatric care
• Cognitive behavioural therapy (CBT) to address the thinking patterns that maintain use
• Dialectical behaviour therapy (DBT) for emotional regulation and distress tolerance
• Individual and group therapy
• Relapse prevention planning
• Aftercare and outpatient support

On medical aid? 

Substance use disorders, including cannabis use disorder, are prescribed minimum benefits (PMBs) in South Africa. All registered medical aid plans are required to cover addiction treatment. 

Because Houghton House is a fully licensed psychiatric hospital, patients can also claim for psychiatric services for co-occurring conditions that qualify under psychiatric PMBs. Our admissions team can walk you through what your specific plan covers and handle pre-authorisation on your behalf.

Frequently asked questions about cannabis in South Africa

Is it legal to smoke dagga in public?

No. The 2018 Constitutional Court ruling only decriminalised private use and home cultivation. Using cannabis in public remains illegal, as does buying, selling, or supplying it to anyone. If you’re uncertain about your legal position in a specific situation, consult a lawyer.

Can you become dependent on cannabis if you only use it occasionally?

Occasional use carries a much lower risk than daily use, but it’s not zero. Dependence is more likely with frequent use, high-THC products, and use that starts in adolescence, but some people develop a problematic relationship with cannabis without ever considering themselves heavy users. The pattern to watch for isn’t how often you use it, but whether you’re finding it difficult to stop or function without it.

Is it legal to grow dagga at home in South Africa?                                           

Home cultivation for personal use was decriminalised by the 2018 Constitutional Court ruling. Adults can grow cannabis plants in private without facing prosecution. Adults are allowed to cultivate a maximum of five (5) plants per person. Whatever you grow must stay private, must be for your own use, and cannot be sold or given to anyone else. Sharing cannabis, even without payment, is still considered supply and remains illegal. 

Are cannabis clubs or collectives legal in South Africa?                                     

Cannabis clubs, where members pool resources to cultivate and share cannabis, operate in a significant legal grey area. The 2018 ruling protects individual private use and cultivation, but that protection doesn’t clearly extend to shared growing arrangements or collective distribution, even among members. 

Clubs are not explicitly authorised under current law, and “sharing” cannabis between members can still be characterised as supply, which remains illegal. Some clubs have operated openly, but there have also been police raids and prosecutions. If you’re involved in or considering joining a cannabis club, get legal advice before doing so. 

How long does dagga stay in your system?

Detection times depend on the test type and frequency of use. For occasional users, cannabis is typically detectable in urine for 3–4 days. For regular or daily users, it can remain detectable for up to 30 days or longer.

Does cannabis make anxiety worse?

For many people, yes. While some users report short-term relief from anxiety, regular use is associated with increased anxiety and depression over time. Some people experience acute panic and paranoia even from moderate use. In people with a predisposition to anxiety disorders, regular cannabis use can make the underlying condition significantly worse.

Is cannabis a gateway drug?

The research doesn’t support the idea that cannabis pharmacologically primes the brain for harder drugs. But heavy use in adolescence is associated with higher rates of other substance use later in life, and using cannabis to manage emotional pain often doesn’t work long-term. When the underlying distress isn’t being addressed, escalation to stronger substances is a genuine risk.

Get help for cannabis addiction at Houghton House

If cannabis use has become something you’re struggling to control, or if you’re concerned about someone close to you, our team can help you work out what’s happening and what your options are.

Call us at +27 11 787 9142, or fill in our contact form.