Cannabis is the most widely used drug in the UK. It is also the substance people are most likely to use for years without ever questioning whether they have a problem, until stopping feels much harder than they expected.
Cannabis addiction is one of the most debated and most misunderstood areas in addiction medicine. The short answer is yes — cannabis can and does cause dependency. The longer answer is that the picture is more nuanced than with alcohol or opioids, which is partly why so many people who are dependent on cannabis don’t recognise themselves in the word addiction at all.
Around one in ten people who use cannabis regularly will develop signs of dependency. Among daily users, that figure rises to around one in three. Signs of cannabis dependence in England nearly doubled between 2014 and 2023 to 2024 — from 2.8% to 5.4% of adults — and researchers found this rise is not explained by more people using cannabis, but by the dramatically increased potency of the cannabis now most widely available. High-THC strains and cannabis vapes have changed what regular use actually means for the brain.
Cannabis is now the second most common reason people seek help through drug treatment services in England, accounting for more than one in five new entrants to treatment in 2024 to 2025.
Cannabis goes by many names — weed, marijuana, skunk, hash, pot to name a few. These names can refer to slightly different forms of the same plant or its derivatives, but they all describe products derived from the Cannabis sativa plant and share the same active compounds, primarily THC (tetrahydrocannabinol) and CBD (cannabidiol).
The form matters for understanding dependency risk. Herbal cannabis — what most people call weed or skunk — is smoked in joints or through a bong and has become progressively higher in THC content over recent decades. Resin or hash — a compressed form of cannabis — typically has lower THC content.
Cannabis vapes have become increasingly common and present a particular risk — the concentration of THC in vape cartridges can be significantly higher than in smoked cannabis, and the discreet format makes it easier to use more frequently without the visible ritual that smoking involves. Many people using cannabis vapes daily do not think of themselves as cannabis users in the traditional sense.
Cannabis dependency develops differently from alcohol or opioid dependency — there is no dramatic physical withdrawal syndrome and no acute medical danger from stopping. This is one of the main reasons people underestimate it. Because stopping isn’t dangerous in the same way that stopping alcohol can be, the assumption is often that it isn’t really addiction.
The cannabis most widely available in the UK today — predominantly high-potency herbal strains commonly known as skunk — produces significantly stronger effects than the cannabis of previous decades, and binds to cannabinoid receptors throughout the brain more aggressively as a result. With repeated exposure, the brain adapts — reducing the number and sensitivity of cannabinoid receptors, requiring more cannabis to produce the same effect. This is tolerance.
Over time, cannabis stops being something that produces a noticeable effect and becomes something that is simply necessary to feel normal. The high disappears but the need remains. Many long-term users describe using not to get stoned but to function — to sleep, to manage anxiety, to get through the day without the restlessness and irritability that come with not using.
That shift — from using to feel something to using to not feel something else — is the signature of dependency, regardless of the substance.
Cannabis dependency is easy to minimise because it builds so slowly and because the cultural narrative around cannabis — that it is natural, relatively harmless, not really a drug in the same sense — provides a constant ready-made justification. Some things worth paying attention to:
Many people who have been using cannabis for years will recognise several of these without having previously called it a problem. The question worth sitting with is not whether the label fits — it is whether the pattern is one you could change easily if you decided to.
The relationship between cannabis and mental health is bidirectional and significant. Cannabis is widely used to manage anxiety, low mood, and the psychological discomfort associated with stress or trauma. It works, in the short term. The problem is that regular heavy use — particularly of high-THC cannabis — is consistently associated with worsening anxiety, depression, and in some people, paranoia and psychotic symptoms over time.
This creates a cycle that is particularly difficult to break. Cannabis relieves the anxiety it is eventually worsening. The person uses more to manage the symptoms that the use is partly producing. What began as self-medication becomes a loop that makes the underlying condition harder to treat.
When cannabis dependency exists alongside an anxiety disorder, depression, or trauma, both need to be addressed together. This is what is known as dual diagnosis — and it is particularly common in people seeking help for cannabis dependency, where the mental health dimension has often been present long before the cannabis use became problematic.
For people with ADHD, the relationship between cannabis and self-medication is especially significant. The overlap between neurodivergence, self-medication, and dependency is explored in more detail in our section on neurodivergence and addiction.
Cannabis withdrawal does not carry the medical risk of alcohol or benzodiazepine withdrawal, but it is real — more so than most people expect after long periods of daily use. Irritability, disrupted sleep, low mood, restlessness, and reduced appetite are common in the first week. Most people find the physical symptoms ease within two weeks.
What tends to linger longer is psychological — the habit, the ritual, the association between cannabis and relief. Understanding what stopping cannabis involves helps set realistic expectations before the first difficult week becomes a reason to give up.
Cannabis dependency rarely resolves quickly on its own, particularly when it has been established over years. The combination of psychological habit, mental health overlap, and the way cannabis has been managing real emotional and neurological needs makes self-managed reduction genuinely difficult for most people who have used heavily and for a long time.
The first step is often simply understanding what’s happening and having a conversation about what the right level of support looks like. For some people that conversation leads to outpatient or community support. For others — particularly where use has been daily for many years, where mental health is significantly involved, or where previous attempts to stop have not held — a residential programme provides the structure, distance, and clinical support that makes lasting change possible.
Our cannabis rehab page explains what residential treatment for cannabis dependency involves at Abbington House. If you’d like to speak to someone about your specific situation, our admissions team is available confidentially and without any pressure to commit to anything.
