Addiction & impaired control

Arguments about addiction often turn quickly into arguments about choice.

If somebody chose to drink, take a drug or continue using a substance, the reasoning goes, why should the resulting condition be treated in the same way as other health problems?

That question sounds straightforward. Clinically, it is not.

Modern diagnostic systems do not define dependence simply by whether a person has consumed a substance, or even by whether their use has caused harm. Dependence is concerned with what happens to the person's ability to regulate that use.

The World Health Organization describes substance dependence as a disorder of regulation arising from repeated or continuous use. Its characteristic features include impaired control over substance use, increasing priority given to use over other parts of life, and continued use despite harm or negative consequences. Physiological features such as tolerance and withdrawal may also be present.¹

That does not mean a person with an addiction has no agency. It means the ordinary language of free choice does not fully describe the condition clinicians are assessing.

This distinction matters for equality law.

Use, harmful use and dependence are not the same thing

It is important to separate several ideas that are often blurred together.

A person can drink alcohol or use a drug without being dependent on it. A person can also use a substance in a way that causes harm without necessarily meeting the diagnostic threshold for dependence.

WHO's framework distinguishes harmful patterns of substance use from dependence. Dependence involves impaired regulation of use, not simply the fact of use itself.¹

UK clinical practice makes similar distinctions.

The national clinical guidelines for drug misuse and dependence require clinicians to assess the degree of problem use or dependence, patterns of use, withdrawal, physical and mental health problems, relationships, housing, employment, finances and other areas of functioning.²

The current UK clinical guidelines for alcohol treatment similarly distinguish harmful patterns of drinking from alcohol dependence and provide different treatment approaches depending on the severity and circumstances of the person's condition.³

That matters because CLA is not proposing that everyone who drinks heavily, uses an illegal drug or experiences a substance-related problem should automatically become disabled in law.

The proposal is that addiction should no longer be excluded before the ordinary disability test is applied.

Impaired control is central to dependence

The idea of impaired control sits near the centre of clinical definitions of dependence.

In practical terms, this can include difficulty controlling when use starts, how often it happens, how much is consumed, the circumstances in which it takes place or when it stops. Substance use can begin to take precedence over responsibilities, relationships, health or activities that previously mattered to the person. Use may continue despite consequences which the person understands to be harmful.¹

UK drug-treatment guidance also recognises psychological dimensions of dependence including desire or compulsion to take drugs, difficulties controlling use and the amount of time devoted to obtaining or taking a drug or recovering from its effects.⁴

This is one reason the question “why don't they just stop?” is inadequate as a description of dependence.

Stopping is often precisely the thing the condition has made difficult.

That difficulty is not absolute. People do stop. People enter treatment, make decisions, change their environment and recover. But the fact that recovery is possible does not mean the impairment was imaginary before recovery occurred.

Many health conditions can improve with treatment, behavioural change or sustained effort. Disability law does not normally treat the possibility of improvement as proof that there was never an impairment.

Choice and impairment can coexist

There is a temptation to make this discussion binary.

Either addiction is a completely involuntary disease, or it is simply the result of choices.

Neither position is necessary for the equality question.

People make choices before, during and after the development of dependence. Those choices can influence risk and recovery. At the same time, a defining feature of dependence can be that the person's control over substance use has become impaired.

Those two statements are capable of being true at the same time.

Clinical treatment itself assumes that people retain agency. Treatment involves decisions, motivation, goal-setting and behaviour change. But it also exists because the condition cannot adequately be understood as a series of ordinary, unconstrained choices.

The UK's clinical guidance reflects this balance. Assessment and treatment planning are intended to be collaborative, personalised and non-judgemental, while supporting people to make changes and pursue recovery goals.⁵

Recognising impairment is therefore not the same as denying responsibility or agency.

It is simply a more accurate description of what dependence can involve.

Dependence can have physical consequences as well as behavioural ones

For some substances, dependence can also involve clear physiological adaptation.

Tolerance may develop, meaning that greater quantities are needed to achieve the same effect. Withdrawal symptoms can occur when use is stopped or substantially reduced.

Alcohol provides a particularly clear example.

The UK's current alcohol-treatment guidance says that people with moderate or severe alcohol dependence can develop acute alcohol withdrawal syndrome if they abruptly stop or substantially reduce drinking. In severe cases, withdrawal can produce serious complications requiring urgent medical treatment.⁶

Clinical guidance therefore includes medically assisted withdrawal in both community and specialist inpatient settings, depending on severity and risk.⁷

None of this means that physical withdrawal is required for every addiction. WHO's description makes clear that physiological features may be present rather than treating them as universal.¹

But where they are present, they provide an especially obvious illustration of why dependence cannot always be reduced to a moral judgement about someone's willingness to stop.

The effects can extend into ordinary life

Dependence can affect far more than the act of taking a substance.

UK clinical guidance asks practitioners to consider the effects of drug dependence on physical health, mental health, relationships, housing, social integration, childcare, finances, education and employment.²

That is significant when considering the Equality Act.

The ordinary disability test is concerned with whether an impairment has a substantial and long-term adverse effect on normal day-to-day activities.

Many of the areas clinicians assess in people with serious dependence are therefore closely related to the kinds of functional effects disability law is designed to examine.

This does not mean that dependence will always satisfy the legal test.

A person whose condition is mild, short-lived or has no substantial effect on ordinary activities may not qualify.

Another person's condition may be very different.

The argument for reform is that the law should be allowed to examine that difference.

We do not need to settle the “disease model” debate

Discussions about addiction sometimes become arguments about whether addiction should be called a disease.

There are scientific, philosophical and clinical debates about the different models used to explain addiction. Those debates are legitimate.

But the Equality Act question does not depend on resolving them.

CLA's proposal does not require Parliament to declare that every addiction is a disease. Nor does it require one particular theory of why addiction develops.

The narrower point is enough:

dependence is a recognised clinical condition which can involve impaired control, physiological adaptation, persistence despite harm and substantial disruption to everyday functioning.

That is sufficient to raise the question of why it should be uniquely prevented from even being considered under the ordinary disability test.

The healthcare system already treats dependence as a clinical problem

There is a noticeable tension in the current British approach.

The health system assesses dependence clinically.

Government publishes detailed guidance for diagnosing, assessing and treating it. The NHS and commissioned services provide psychological interventions, medication, medically assisted withdrawal, harm reduction and long-term recovery support. Drug-treatment guidance is explicitly directed at clinicians treating people with drug dependence, while current alcohol guidance covers harmful drinking and alcohol dependence as health conditions requiring evidence-based care.²³

Yet for Equality Act purposes, addiction is singled out by regulation and treated as not amounting to an impairment, except where it originally resulted from medically prescribed drugs or treatment.⁸

Healthcare and equality law are answering different questions, so some difference between the systems is inevitable.

But the contrast is still striking.

One part of the state recognises and treats dependence as a condition capable of requiring specialist clinical intervention. Another tells decision-makers that the addiction itself cannot count as an impairment when considering disability discrimination.

Removing the exclusion would not make diagnosis decisive

There is an important safeguard in CLA's proposal.

Removing the addiction exclusion would not mean that a diagnosis automatically became a disability.

The Equality Act's ordinary test would still apply.

The question would be whether the person's condition amounted to a physical or mental impairment and whether its adverse effects were substantial and long-term.

That requires individual evidence.

It is entirely possible that one person with a substance-use problem would not satisfy the test while another person with severe, enduring dependence would.

That is not a weakness in the proposal.

It is the point of it.

Disability law generally asks what a condition actually does to the individual rather than assuming that everyone with a particular diagnosis has identical needs or limitations.

Addiction is unusual because the regulations prevent that ordinary enquiry from taking place in relation to the addiction itself.

Clinical recognition is not absolution

Recognising addiction as capable of causing impairment would not settle questions of workplace conduct, criminal responsibility, family responsibilities or personal accountability.

Those are separate questions.

A health condition can help explain behaviour without making every consequence of that behaviour acceptable.

As Evidence Note 003 explains, disability protection would not create a right to take drugs at work, attend work intoxicated, ignore safety rules or avoid proportionate disciplinary action.

Read Evidence Note 003: Disability protection is not permission.

The relevant question here is narrower.

Can serious dependence genuinely impair a person's functioning?

Modern clinical evidence says that it can.

Why this matters to the proposed amendment

The current regulations answer the disability question categorically before the person's actual condition is examined.

CLA proposes a different approach.

Do not assume that every person experiencing addiction is disabled.

Do not assume that none of them can be.

Look at the evidence.

Look at the severity and duration of the condition.

Look at its effect on the person's ordinary life.

Then apply the same legal test used for other physical and mental impairments.

That is a considerably narrower proposition than saying addiction removes choice or responsibility.

It recognises something that clinical practice already does: dependence exists on a spectrum, people differ, and serious cases can involve genuine impairment.

The law does not need to decide whether addiction is wholly chosen or wholly involuntary.

It needs to stop using that argument as a reason not to look at the person in front of it.

References

World Health Organization. ICD-11 framework for substance use disorders and dependence, describing dependence as impaired regulation of substance use, including impaired control, increasing priority and persistence despite harm. WHO; see also WHO ICD-11 Clinical Descriptions and Diagnostic Requirements.
Department of Health and Social Care. Drug misuse and dependence: UK guidelines on clinical management (Orange Book), current GOV.UK publication updated August 2026. GOV.UK.
Department of Health and Social Care. Clinical guidelines for alcohol treatment, published November 2025 and updated April 2026. GOV.UK.
Department of Health and Social Care. Drug misuse and dependence: UK guidelines on clinical management, discussion of psychological dimensions of dependence including compulsion, difficulty controlling use and time devoted to drug use. Clinical guidelines.
Department of Health and Social Care. Clinical guidelines for alcohol treatment: assessment and treatment and recovery planning. GOV.UK.
Department of Health and Social Care. Clinical guidelines for alcohol treatment: Annex 3 — alcohol withdrawal symptoms. GOV.UK.
Department of Health and Social Care. Clinical guidelines for alcohol treatment: community based and specialist inpatient medically assisted withdrawal. Community withdrawal; Specialist inpatient withdrawal.
Equality Act 2010 (Disability) Regulations 2010, regulations 2 and 3. Legislation.gov.uk.