ADHD, Autism and Substance Use: Understanding the Link

Neurodivergence and substance use describes how ADHD, autistic and AuDHD adults often use alcohol, cannabis, nicotine or other substances to regulate a strained nervous system, not just for fun. Adults with ADHD have higher rates of substance use. Understanding what a substance is doing for you, and building other ways to meet that need, usually helps more than shame.

By Michael Holker, MSW, RSW · Published February 2025 · Updated October 2026

"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.

In my work with neurodivergent adults, the drink at the end of the day is rarely about the drink.

Who Is This Post For?

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.

Becoming Yourself Counselling and Consulting offers neurodiversity-affirming therapy, online across Ontario, that can explore substance use alongside ADHD, autism, burnout and shame. We are not a detox or addiction treatment program. If you're worried about withdrawal, or your use has become dangerous, ConnexOntario (1-866-531-2600) can connect you with treatment services across Ontario, and you can call or text 9-8-8 any time if you're in crisis.

Why do 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.

Neurodiversity-affirming therapy in Ontario provides exactly that — an approach that understands how your nervous system works and builds from there, rather than imposing strategies that assume a neurotypical baseline.

Are People With ADHD More Prone to Addiction?

Research suggests they are: substance use is significantly more common in people with ADHD than in the general population. A meta-analysis of 27 long-term studies found that children with ADHD were significantly more likely than their peers to go on to use nicotine, alcohol, cannabis and other substances, and to develop substance use problems in adolescence and adulthood (Lee et al., 2011). Reviews of adults living with both ADHD and a substance use disorder, including a VA Evidence Synthesis by Rieke and colleagues (2024) and a meta-analysis by Fluyau and colleagues (2021), show that the combination is common enough to need specific clinical attention, and that how ADHD is treated matters for people who use substances.

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.

What Is Self-Medicating ADHD?

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. If this pattern sounds familiar, ADHD therapy for adults in Ontario can help with what sits underneath it.

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.

For those using substances to manage the anxiety of not knowing, How to Cope with Uncertainty as a Neurodivergent Adult addresses that underlying pattern.

Why Do Some Adults With ADHD Drink to Cope?

For many adults with ADHD, alcohol is the most available tool for a very specific job: switching off. After a day of holding attention together by force, a drink can quiet the mental noise, soften the self-criticism and make it possible to finally stop. In social settings, it can ease the work of monitoring yourself in every conversation.

It makes sense that this becomes a habit. Alcohol works quickly and predictably, and it rarely requires explanation. But many people notice the relief comes with costs: poorer sleep, harder mornings, and more impulsivity, which can make ADHD feel worse the next day. If you take ADHD medication, it's worth talking with your prescriber about alcohol too.

The useful first question is rarely "how do I stop?" It is usually "what is the drink doing for me at six o'clock, and what else could do part of that job?"

How Does Substance Use Show Up for Autistic and AuDHD Adults?

For autistic and AuDHD adults, the picture is more varied: some avoid substances entirely, while others use them for social ease, sensory relief or managing co-occurring ADHD.

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 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 (Raymaker et al., 2020).

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 Does Shame Make Substance Use Harder to Change?

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. Research on self-compassion suggests that meeting struggle with kindness, rather than contempt, makes it easier to look honestly at what needs to change (Neff, 2011).

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. For many men, that reflex is reinforced by masculine socialization, which is part of why recognizing your own needs can be so difficult.

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 Is It So Hard to Cut Back When Substances Help You Cope?

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 Can It Fit Neurodivergent Adults?

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. In a survey of 475 autistic adults who use substances, participants called for harm-reduction approaches adapted to autistic people, alongside more accessible, neuro-affirming services (Munday et al., 2025).

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.

How Can You Understand Your Own Pattern?

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."

What Does Healthier Coping Look 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, you're welcome to meet our team and book a free 20-minute meet-and-greet. If autism is part of your picture, you can also read about autism therapy for adults in Ontario. No performance required.

FAQ about Substance Use and Neurodivergence

Are neurodivergent people more prone to addiction?

Research suggests that neurodivergent adults, particularly those with ADHD, have higher rates of substance use and substance use disorders than the general population. The reasons are neurological rather than moral: differences in dopamine and reward, executive function, and sensory and emotional load. For autistic adults the picture is more varied; some avoid substances entirely.

Is there a link between ADHD and substance use?

Yes. It is one of the most consistent findings in ADHD research. People with ADHD show higher rates of alcohol, cannabis, nicotine and other substance use, often starting earlier. Dopamine and reward differences, impulsivity and the search for relief all play a part, and ADHD that hasn't been recognized or supported can make substances more appealing.

What is self-medicating ADHD?

Self-medicating ADHD means using substances such as alcohol, cannabis, nicotine or stimulants to manage the attention, regulation and emotional challenges of ADHD, often before a diagnosis. It isn't a character flaw. It's an understandable attempt to cope with a nervous system that hasn't had the right support.

Is there a link between autism and substance abuse?

Research suggests autistic adults can experience substance-related problems at higher rates, especially when ADHD is also present. Reasons for use vary: easing social anxiety, sensory regulation, emotional coping or relief from overwhelming internal states. Many autistic adults avoid substances entirely, so understanding the function for the individual matters more than general risk.

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

Harm reduction focuses on reducing the negative consequences of substance use rather than requiring abstinence before someone can get support. It often fits neurodivergent adults well, because it leaves room for honesty, partial progress and gradual change, instead of an all-or-nothing standard that black-and-white thinking can make fragile.

Does substance use mean someone lacks discipline?

No. A substance use pattern usually reflects a coping strategy shaped by real relief, unmet regulatory needs, habit and a lack of alternatives, not a failure of willpower. Addressing what sits underneath, such as sensory strain, burnout, untreated ADHD and shame, tends to change the pattern more reliably than self-criticism.

Is there a link between ADHD and an addictive personality?

“Addictive personality” isn't a clinical diagnosis, but many people with ADHD recognize the pattern it describes. Sensitivity to reward, a pull toward novelty and difficulty pausing between impulse and action can make substances, and behaviours like gaming or shopping, harder to moderate. Seeing it as nervous-system wiring rather than character is a kinder, more useful starting point.

Can I get support for substance use at Becoming Yourself?

We offer neurodiversity-affirming therapy that can explore substance use alongside ADHD, autism, burnout and shame, online across Ontario. We are not a detox or addiction treatment program. If you're worried about withdrawal or severe use, ConnexOntario (1-866-531-2600) can connect you with treatment services.

Key Takeaways

• Substance use often does real regulatory work. Understanding that function matters more than judging the behaviour.
• ADHD and substance use are closely linked through dopamine and reward differences, impulsivity, and the search for relief.
• Autism and substance use are more varied. Some autistic adults avoid substances; others use them for sensory, social or emotional regulation.
• Self-medicating ADHD is common and under-recognized, and often starts years before a diagnosis explains what was being managed.
• Alcohol is often used to switch off after a day of effortful attention, but the relief can carry next-day costs.
• Shame makes change harder. When substance use is held in shame, it goes underground instead of being understood.
• Harm reduction often fits neurodivergent adults well, because it keeps partial progress visible instead of demanding all-or-nothing abstinence.
• You are still a whole person. Getting help doesn't require being treated as broken, or waiting until things become severe.

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

Lee, S. S., Humphreys, K. L., Flory, K., Liu, R., & Glass, K. (2011). Prospective association of childhood attention-deficit/hyperactivity disorder (ADHD) and substance use and abuse/dependence: A meta-analytic review. Clinical Psychology Review, 31(3), 328–341. https://doi.org/10.1016/j.cpr.2011.01.006

Munday, K., Papadopoulos, C., Adkin, T., & Gray-Hammond, D. (2025). Improving substance-use services for autistic adults: Insights and recommendations from autistic adults. Autism in Adulthood, 8(5), 877–889. 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., Sereda, Y., Mai, H. J., Benz, M. B., Rudolph, J., Dew, R., Primack, J. M., McGeary, J. E., Rickard, T., Trikalinos, T. A., & Jutkowitz, E. (2024). ADHD and substance use disorders in adults: A systematic review. Evidence Synthesis Program, Health Services Research and Development Service, U.S. Department of Veterans Affairs. https://www.hsrd.research.va.gov/publications/esp/adult-adhd-report.pdf

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 →

This article is for education and reflection. It is not a substitute for individualized assessment or therapy. If you are in crisis or thinking about suicide, call or text 9-8-8, Canada’s Suicide Crisis Helpline, any time, or call 911. For help finding mental health or addictions services in Ontario, contact ConnexOntario at 1-866-531-2600.

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