Substance Use and Neurodivergence — Understanding the Connection Without Shame

"Addiction is an adaptation. It's not you — it's the cage you live in." — Johann Hari

There is a particular kind of evening that many neurodivergent adults know.

The workday is over. The social obligations are behind you. The interactions that required translation, the environments that required management, the executive function that was asked to perform beyond what it reliably had — all of it is technically done. And somewhere between leaving and arriving home, or in the first quiet moment after the door closes, there is a reach. A drink. A joint. A cigarette. Something that changes the state quickly, reliably, without requiring explanation or negotiation.

It is rarely described, in those moments, as recreation. It is closer to relief.

This is where conversations about substance use and neurodivergence need to begin — not with statistics or risk factors, but with the honest recognition that for many neurodivergent adults, substance use has been doing real work. Regulatory work. Social work. Emotional work. The kind of work that the person has not, for one reason or another, been given another reliable way to do.

If that recognition is missing from the conversation, the conversation is almost always too shallow to produce meaningful change.

Substance use and neurodivergence refers to the intersection of neurodivergent neurological profiles — including ADHD, autism, and AuDHD — with patterns of substance use that often emerge as self-regulatory, social, or sensory coping strategies rather than primarily recreational ones. Research consistently documents elevated rates of substance use and substance use disorders in adults with ADHD, with dopamine dysregulation, executive function differences, and reward sensitivity as key mechanisms. For autistic adults, substance use patterns are more varied, often serving functions including social ease, sensory regulation, and management of co-occurring ADHD. A harm-reduction, neurodivergent-affirming approach — which addresses the coping function of substance use alongside the behaviour itself — tends to produce more meaningful and durable change than shame-based or abstinence-only frameworks.

What This Post Is — And What It Isn't

This is not a post about addiction treatment or clinical intervention. If you are in a crisis related to substance use, please reach out to a qualified health professional or contact a crisis line directly.

This is a post about understanding — about the specific ways that substance use and neurodivergence intersect, why the connection exists, and what a more compassionate and realistic approach to change can look like. It is written for neurodivergent adults who are curious about their own patterns, for their partners and family members who want to understand, and for anyone who has been told that the solution is simply to stop — and found that instruction predictably incomplete.

It is also written from a harm-reduction orientation. Harm reduction is not permission to use without thought. It is the recognition that change happens more reliably in the presence of honest understanding, self-compassion, and realistic support than in the presence of shame and all-or-nothing ultimatums.

Why Substance Use and Neurodivergence Often Go Together

For many neurodivergent adults, substance use begins less as recreation than as regulation — an attempt to manage a nervous system that exists in chronic mismatch with its environment.

That sentence is not a justification. It is a description. And it is clinically important, because if we understand only the behaviour and not the function it is serving, we consistently misunderstand the pattern.

A neurodivergent nervous system in a neurotypical world is frequently managing more than it appears to be from the outside. The processing demands are higher. The sensory load is often significant. The social translation work — converting internal experience into external legibility — is ongoing and costly. And for adults with ADHD in particular, the baseline access to dopamine and the reward system works differently than it does for neurotypical adults, which shapes motivation, impulse regulation, and the search for stimulation or relief in ways that are neurological rather than volitional.

Substances can temporarily bridge several of these gaps.

A drink can soften social friction — reducing the self-consciousness that makes certain interactions exhausting. Cannabis can quiet sensory noise — making the environment feel less like an assault and more like background. Nicotine or other stimulants can create a sense of urgency or focus that the executive function struggles to generate on its own. Alcohol at the end of the day can interrupt the cycling of the ADHD brain that makes genuine rest difficult to access.

None of this means the substance is a good long-term solution. But it means the substance is, in the short term, doing something the person has not found another reliable way to do. And until that function is understood and addressed, conversations about stopping tend to feel — accurately — like being asked to remove a crutch without being offered anything to stand on instead.

The Research Picture — What We Actually Know

Substance use is significantly more common in people with ADHD than in the general population. A comprehensive VA Evidence Synthesis by Rieke and colleagues (2024) confirmed robust associations between ADHD and substance use disorders across multiple substances, with ADHD associated with earlier onset of use and greater severity. Research by Fluyau and colleagues (2021) found that the co-occurrence of ADHD and substance use disorder is common enough that it requires specific clinical attention — and that untreated ADHD is itself a meaningful risk factor for ongoing substance use.

The ADHD-substance use connection has several neurological roots. The interest-based nervous system of ADHD is particularly responsive to substances that quickly shift state. The dopamine regulation differences that characterize ADHD create a nervous system that is chronically under-stimulated in ordinary conditions and that responds powerfully to the rapid dopamine release that many substances provide. Executive function challenges — including difficulty regulating impulses, initiating alternatives to familiar behaviours, and tolerating discomfort without immediate relief — all increase the difficulty of changing established use patterns even when the person genuinely wants to.

The picture for autism is more complex and less well-researched. Research by Weir and colleagues (2021) used a mixed-methods approach to explore substance use in autistic adults and found that motivations varied significantly, including use for social ease, emotional management, sensory coping, and relief from internal states that otherwise felt difficult to tolerate. Importantly, some autistic adults in this research described substances as one of the few tools that made certain social environments genuinely navigable, or that provided reliable downregulation after overwhelming days.

What the research consistently does not support is the idea that substance use in neurodivergent adults is primarily a motivation problem or a discipline failure. The patterns are more specific, more contextual, and more neurologically grounded than that framing allows.

Self-Medicating ADHD — The Most Common Pattern

Self-medicating ADHD is one of the most common and least-named dynamics in neurodivergent substance use. It refers to the use of substances — most commonly alcohol, cannabis, nicotine, or stimulants — to manage the regulatory and attentional challenges of ADHD when those challenges are either untreated, undertreated, or treated in ways that don't fit.

It is worth naming this honestly, because the term "self-medication" can sound clinical and distant in a way that does not capture the lived experience. What it actually looks like is often something like this:

You have spent a day white-knuckling through tasks that required sustained attention your brain does not reliably generate. You have managed transitions that created internal chaos. You have navigated interpersonal dynamics that required emotional regulation your system was not fully providing. And at the end of that day, you have found something that shifts the internal climate quickly — that provides relief, focus, or the ability to finally stop cycling through the unfinished loops your brain has been running all day.

That pattern is not weakness. It is adaptation. And it is one that many adults with ADHD discover years before they understand what they are actually managing.

"Untreated ADHD and substance abuse" is a frequently searched phrase because the connection is real and often experienced before it is understood. Adults who have not yet received an ADHD diagnosis — or who have received one but are not adequately supported — often find that substances are doing the regulatory work that treatment would otherwise provide. For these adults, formal ADHD support — therapy, medication review where appropriate, and the development of alternative regulatory strategies — often changes the relationship with substances more meaningfully than willpower-based approaches.

Autism, AuDHD, and Substance Use — A More Nuanced Picture

The relationship between autism and substance use is not as straightforward as the ADHD connection, and it is important to say so clearly. Some autistic adults avoid substances altogether — because of sensory sensitivity, strong preference for predictability, or a very different relationship with social situations than the one that drives use in others. Others find that substances serve specific and deeply felt functions that are worth understanding.

Research by Weir and colleagues (2021) found that autistic adults described using substances for several distinct purposes: to reduce social anxiety and make masking feel more manageable, to regulate sensory overload, to manage co-occurring ADHD symptoms, to cope with emotional intensity, and to create reliable transitions between states that their nervous system struggled to shift between naturally.

For AuDHD adults — those navigating both autism and ADHD simultaneously — the substance use picture can become particularly layered. The ADHD dimension may drive the search for stimulation or state-change; the autistic dimension may shape strong preferences for specific rituals or substances; and the combined masking load of managing both profiles in neurotypical environments can create a level of chronic depletion that makes any reliable source of relief feel indispensable.

What the research and clinical experience both suggest is that oversimplified narratives in either direction — "neurodivergent people are more prone to addiction" or "autistic people don't use substances" — miss the specificity that makes these patterns understandable and therefore addressable.

Why Shame Makes Everything Harder

Many neurodivergent adults already carry significant shame — about inconsistency, about apparent underperformance, about the gap between their capabilities and their output, about needing more than others seem to need. When substance use is added to that picture, the shame compounds.

And shame, as a change strategy, reliably fails.

When a person is ashamed of a coping pattern, they tend to conceal it rather than examine it. They tend to focus on proving they don't need help rather than honestly assessing whether they do. They tend to oscillate between rigid attempts to stop and the relief of returning to the familiar pattern, with each cycle adding another layer of self-contempt.

A non-shaming approach to substance use and neurodivergence does not mean minimizing risk or pretending that established use patterns carry no cost. It means being accurate about what is actually happening and why — because accuracy is what makes genuine change possible.

If something is functioning as relief, then understanding that relief is clinically essential. Without it, conversations about change remain at the level of the behaviour rather than the function, which is why so many of those conversations produce so little durable change.

This is where trauma-informed care for neurodivergent adults offers an important lens. Many of the underlying conditions that make substance use feel necessary — chronic nervous system strain, internalized shame, inadequate support, unaddressed trauma — are addressed more effectively through trauma-informed and neurodivergent-affirming care than through approaches that treat the substance use in isolation.

Why Change Can Feel So Hard

People often judge themselves harshly for not changing faster, and they receive the same judgment from others. But if a substance has become linked to relief, ritual, and predictability, change is not only about giving something up. It is also about losing a strategy that has been doing real work — often for a very long time, in the absence of anything else that worked as reliably.

The person who is trying to stop or reduce is not only losing the substance. They may also be losing:

• A predictable transition between work and rest
• A social tool that made certain interactions genuinely manageable
• A way to quickly change internal state when the nervous system feels stuck
• A pause from the inner critic
• A ritual that has become one of the few reliably calming structures in the day

This is one reason sudden abstinence without replacement can feel unbearable for some people — not because they lack willpower, but because the underlying needs the substance was meeting remain unaddressed. The person isn't simply choosing the substance over their own well-being. They are experiencing what it feels like to lose a regulatory strategy without having another one in place.

Understanding this does not excuse patterns that are causing harm. But it does change the clinical question from "why won't this person just stop?" to "what would need to be in place for stopping or reducing to be genuinely sustainable?"

What Is Harm Reduction — And Why It Often Fits Better

Harm reduction is an approach to substance use that prioritizes reducing the negative consequences of use over demanding abstinence as a precondition for support and care. It is not permission to use without reflection. It is the recognition that people are more likely to engage honestly with their patterns — and to make meaningful changes — when they are not required to lie about their use or to present as completely abstinent in order to receive help.

For neurodivergent adults, harm reduction often fits particularly well for several reasons.

The all-or-nothing thinking that characterizes many neurodivergent nervous systems makes perfectionist abstinence-only frameworks particularly prone to collapse. A single instance of use after a period of not using becomes, through the all-or-nothing lens, evidence of total failure, which removes the motivation to try again. Harm reduction interrupts that logic by keeping partial progress visible and meaningful.

Harm reduction also creates space for honest self-examination — of pattern, trigger, cost, function, and readiness — without requiring the person to first declare themselves in crisis or to commit to a goal they are not yet able to sustain. For many neurodivergent adults, that space is what makes honest reflection possible in the first place.

Understanding Your Own Pattern — Questions Worth Sitting With

If substance use has become a pattern you are concerned about, the most useful starting place is usually not a decision about stopping. It is an honest understanding of what is actually happening.

Some questions worth sitting with:

What function is this actually serving for me? Not what I think I should say, but what is honestly true. Is it sensory relief? Social ease? Emotional regulation? A way to stop the brain from cycling at the end of the day?

What tends to happen before I reach for it? What state am I in? What has the day contained? What needs went unmet?

What would be hardest about reducing it? What would I lose? What does the pattern protect me from having to feel or face?

Where am I chronically under-supported? Is there something the substance is compensating for that could be addressed more directly — untreated ADHD, inadequate sensory accommodation, chronic loneliness, burnout, unaddressed trauma?

What strategies have I never really been helped to build? Not the generic advice I've received, but actual alternatives that fit how my nervous system works.

These questions do not resolve anything on their own. But they often reveal the actual terrain, which is almost always more complex and more specific than "I need to have more willpower."

Moving Toward Healthier Coping — What This Actually Looks Like

Healthier coping with substance use is rarely just about saying no harder. More often, it involves building other pathways for the regulation, relief, and support that the substance has been providing, which is a different and more honest project than most willpower-based approaches allow.

That may include:

Identifying high-risk times and environments. Not to avoid them forever, but to understand them — and to approach them with more deliberate preparation and more realistic expectations.

Building transitions that reduce the need for chemical downshifting. For many neurodivergent adults, the most substance-prone moments are transitions — between work and home, between high-demand and low-demand, between social and solitary. Creating other transition rituals — movement, sound, sensory change, brief decompression — can reduce the urgency that pulls toward substances in those moments.

Addressing what is underneath. Untreated ADHD, chronic burnout, sensory overload, unaddressed anxiety, loneliness, and shame are not peripheral to substance use in neurodivergent adults — they are often central to it. Therapy that addresses these underlying conditions changes the landscape of use more meaningfully than approaches focused only on the behaviour. How I work with neurodivergent adults in neuroaffirming therapy describes what that kind of support can look like in practice.

Creating more honest language around need and distress. Part of what makes substance use so sticky for neurodivergent adults is that it solves the problem silently — without requiring the person to name what they need, ask for support, or tolerate the vulnerability of being seen in difficulty. Building language and building relationships where that language is welcome reduces the functional isolation that makes substances feel necessary.

Getting help without waiting until things become severe. One of the most consistent patterns in this population is the tendency to minimize until the situation is undeniable. A more realistic standard is: if you are concerned enough about a pattern to be reading about it, that concern is worth taking seriously.

For a broader look at rest and recovery as nervous system regulation, why rest is productive for neurodivergent minds offers a reframe that is relevant to anyone trying to reduce the daily nervous system load that makes substances feel so necessary.

Recovery, Dignity, and Not Being Reduced to a Coping Pattern

Substance use can absolutely become harmful, destabilizing, and in some cases, dangerous. That truth matters and deserves to be named directly.

And so does this one: a neurodivergent adult who is struggling with substance use is still a whole person. They are not only their coping pattern. They are not only having their worst night. They are not only the thing they carry the most shame about.

Many people need a framework that can hold both the honest concern and the full dignity of the person at the same time. A framework that can say: this matters, this deserves real attention, and you do not have to be treated as broken in order to receive help.

For many neurodivergent adults, that combination — honest concern held without contempt — is what makes genuine honesty possible in the first place. And genuine honesty, in my experience, is almost always where meaningful change begins.

If you have recognized something of yourself in this post — if substance use has become part of how you manage a life that asks more than you have reliably had — I would be glad to think about that with you.

The work I do with neurodivergent adults is not about judgment or prescriptions. It is about an honest understanding of what is actually happening and why, and about building something more workable than what has been available so far.

If you would like to explore whether this might be the right kind of support, book a free meet 'n' greet. No performance required.

FAQ about Substance Use and Neurodivergence

Are neurodivergent people more prone to substance use?

Research indicates that neurodivergent adults — particularly those with ADHD — show elevated rates of substance use and substance use disorder compared to the general population. The reasons are specific and neurological rather than moral: dopamine regulation differences, executive function challenges, sensory and emotional load, and the self-medication of unmet or undertreated regulatory needs all contribute. For autism, the picture is more complex — some autistic adults avoid substances while others use them for specific functions including sensory regulation, social ease, and management of co-occurring ADHD symptoms.

Is there a link between ADHD and substance use?

Yes — and it is one of the most consistently documented findings in the ADHD research literature. Adults with ADHD show significantly elevated rates of alcohol use, cannabis use, nicotine use, and other substance use compared to neurotypical adults. The connection is understood through the neurobiology of ADHD: dopamine dysregulation, reward sensitivity, executive function differences, and the chronic search for state-change or relief all create conditions in which substances can feel particularly compelling. Untreated or undertreated ADHD is itself a risk factor, which is why formal ADHD support often changes the relationship with substances more meaningfully than willpower-based approaches alone.

What is self-medicating ADHD?

Self-medicating ADHD refers to the use of substances to manage the regulatory, attentional, and emotional challenges of ADHD — particularly when those challenges are untreated, undertreated, or treated in ways that don’t fit the individual. It commonly involves alcohol, cannabis, nicotine, or stimulants, and it often begins before the person understands what they are actually managing. Self-medication is not a character flaw. It is an adaptive response to a neurological reality that has not had adequate support, and understanding it as such is often the beginning of genuinely changing it.

Is there a link between autism and substance abuse?

Research suggests autistic adults experience substance use-related problems at elevated rates compared to the general population, with rates particularly elevated when co-occurring ADHD is present. The reasons for use in autistic adults tend to be more varied than in ADHD, including social anxiety management, sensory regulation, emotional coping, and relief from internal states that otherwise feel difficult to tolerate. Not all autistic adults use substances; some avoid them entirely. Understanding the specific function for the specific person is more useful than generalized risk statements.

What is harm reduction, and does it work for neurodivergent adults?

Harm reduction is an approach to substance use that focuses on reducing the negative consequences of use — rather than requiring abstinence as a precondition for support. It tends to fit neurodivergent adults well because it works with the realities of how change actually happens rather than demanding a standard of immediate, total abstinence that all-or-nothing thinking can make particularly fragile. Harm reduction creates space for honest self-examination, partial progress, and the gradual development of alternatives — all of which tend to support more durable change than shame-based approaches.

Does substance use mean someone lacks discipline?

No. In most cases, substance use that has become a pattern reflects a coping strategy shaped by genuine relief, unmet regulatory need, habit, and the absence of adequate alternatives — not willpower failure. This is particularly true for neurodivergent adults whose nervous systems have been managing more than their environments typically accommodate. Addressing the underlying conditions — the sensory strain, the burnout, the untreated ADHD, the shame, the chronic overextension — changes the landscape of substance use more reliably than increasing self-criticism.

Key Takeaways

• Substance use in neurodivergent adults often has a genuine regulatory function. Understanding that function — rather than only addressing the behaviour — is essential to meaningful and durable change.
• ADHD and substance use are robustly linked through specific neurological mechanisms: dopamine regulation differences, reward sensitivity, executive function challenges, and the search for state-change or relief. Untreated ADHD is itself a risk factor.
• Autism and substance use show a more complex relationship. Some autistic adults avoid substances entirely; others use them for specific functions, including sensory regulation, social ease, and management of co-occurring ADHD. Elevated rates are particularly documented when both autism and ADHD are present.
• Self-medicating ADHD is a common and under-recognized pattern. Many adults with ADHD discover and rely on substances for regulatory purposes years before they understand what they are managing — and formal ADHD support often changes that relationship more meaningfully than willpower-based approaches alone.
• Shame reliably makes change harder. When substance use is held in shame, it tends to go underground rather than being examined honestly. A non-shaming, accurate approach to understanding the pattern is usually what makes genuine reflection and change possible.
• Harm reduction often fits neurodivergent adults particularly well because it works with the reality of how change happens rather than requiring a perfectionist standard of immediate, total abstinence that all-or-nothing thinking tends to make fragile.
• Meaningful change usually requires addressing what is underneath — the sensory strain, the burnout, the untreated ADHD, the unaddressed shame, the chronic overextension that made the substance feel so necessary. Addressing the behaviour without these conditions is rarely sufficient.
• A neurodivergent adult struggling with substance use is still a whole person. The possibility of genuine help does not require being treated as broken first.

References

Fluyau, D., Revadigar, N., & Pierre, C. G. (2021). Systematic review and meta-analysis: Treatment of substance use disorder in attention deficit hyperactivity disorder. The American Journal on Addictions, 30(2), 110–121. https://doi.org/10.1111/ajad.13136

Munday, J., & colleagues. (2024). Improving substance-use services for autistic adults. Autism in Adulthood. https://doi.org/10.1089/aut.2024.0213

Neff, K. D. (2011). Self-compassion: The proven power of being kind to yourself. William Morrow.

Raymaker, D. M., Teo, A. R., Steckler, N. A., Lentz, B., Scharer, M., Delos Santos, A., Kapp, S. K., Hunter, M., Joyce, A., & Nicolaidis, C. (2020). "Having all of your internal resources exhausted beyond measure and being left with no clean-up crew": Defining autistic burnout. Autism in Adulthood, 2(2), 132–143. https://doi.org/10.1089/aut.2019.0079

Rieke, K., & colleagues. (2024). ADHD and substance use disorders in adults. VA Evidence Synthesis Program, NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK594174/

Weir, E., Allison, C., & Baron-Cohen, S. (2021). Understanding the substance use of autistic adolescents and adults: A mixed-methods approach. The Lancet Psychiatry, 8(8), 673–685. https://doi.org/10.1016/S2215-0366(21)00160-8

Michael Holker is a Registered Social Worker and neurodiversity-affirming therapist offering virtual therapy across Ontario. Learn more about working with Michael →

Disclaimer

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