List of Addictions: Substance and Behavioural Addictions Explained
A clear, clinician-reviewed list of the main substance and behavioural addictions, what they have in common, how they differ, which are the most dangerous to stop, and what links them all together.
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician and Addiction Medicine Specialist, Phuket Island Rehab.
Addictions fall into two broad groups: substance addictions and behavioural addictions. The main substance addictions include alcohol, opioids such as heroin and prescription painkillers, stimulants such as cocaine and methamphetamine, prescription stimulants such as Adderall, benzodiazepines, cannabis, nicotine, and hallucinogens and inhalants. The recognised and emerging behavioural addictions include gambling, gaming, internet and smartphone use, sex and pornography, shopping, food, and exercise. What unites every item on this list is that the substance or behaviour hijacks the brain’s reward system, leading to compulsive use despite harm, loss of control, tolerance, and, for substances, withdrawal. Gambling disorder is the most firmly recognised behavioural addiction. The most medically dangerous to stop are alcohol and benzodiazepines, because their withdrawal can cause seizures. Every addiction on this list is treatable, and the right treatment depends on the specific addiction and the person.
Two kinds of addiction
Addictions are usually divided into two broad categories. Substance addictions involve a chemical that a person takes into the body, such as alcohol, opioids, or nicotine. Behavioural addictions, sometimes called process addictions, involve a compulsive behaviour rather than a substance, such as gambling or gaming. For a long time only substance addictions were treated as real addictions, but it is now understood that certain behaviours can hijack the same brain reward system and produce the same loss of control, which is why behavioural addictions are increasingly recognised alongside substance ones.
What every addiction on the list below shares is a core pattern: the substance or behaviour activates the brain’s reward system, the brain adapts so that more is needed to feel the same effect, and the person continues despite mounting harm and despite wanting to stop. This is why addiction is classified as a medical condition of the brain rather than a moral failing. The differences between addictions lie in how strongly they hook the brain, how dangerous they are to stop, and the specific harm they cause, and those differences shape how each one is treated.
The main substance addictions
Substance addictions are the most familiar and include some of the most dangerous. Alcohol is the most widely used and, by total harm, one of the most damaging, and it is also one of the few addictions where withdrawal can be fatal. Opioids, including heroin, fentanyl, and prescription painkillers such as oxycodone and hydrocodone, combine intense reward with a high overdose risk. Stimulants such as cocaine, crack, and methamphetamine overstimulate the heart and brain and cause severe psychological harm, and prescription stimulants such as Adderall are misused in the same way.
The list continues with benzodiazepines, the anti-anxiety and sleeping medications such as Xanax, Valium, and Klonopin, whose withdrawal, like alcohol’s, can cause seizures. Cannabis, in increasingly potent forms, is genuinely addictive despite a common belief otherwise. Nicotine, delivered by smoking or vaping, is one of the most addictive substances of all. Hallucinogens such as LSD and psilocybin and inhalants such as solvents and nitrous oxide complete the broad picture. The table below summarises the main substance addictions, how habit forming they are, and the key danger of each.
| Substance addiction | Examples | Key danger |
|---|---|---|
| Alcohol | Beer, wine, spirits | Withdrawal can be fatal; widespread organ harm |
| Opioids | Heroin, fentanyl, oxycodone, hydrocodone | High overdose risk from slowed breathing |
| Stimulants | Cocaine, crack, methamphetamine | Heart attack, stroke, psychosis |
| Prescription stimulants | Adderall, Ritalin | Cardiac strain, dependence, misuse |
| Benzodiazepines | Xanax, Valium, Klonopin | Withdrawal can cause seizures |
| Cannabis | Marijuana, charas, hashish | Dependence, anxiety, psychosis risk |
| Nicotine | Cigarettes, vapes | Extremely addictive; cancer and heart disease |
| Hallucinogens and inhalants | LSD, psilocybin, solvents, nitrous oxide | Accidents, psychological harm, sudden death from inhalants |
The behavioural addictions
Behavioural addictions involve compulsive engagement in a rewarding behaviour to the point where it causes harm and the person cannot stop. Gambling disorder is the most firmly established, recognised as a behavioural addiction in formal diagnostic systems, and it can be devastating, with financial ruin, family breakdown, and one of the highest suicide rates of any addiction. Gaming disorder is also now formally recognised, particularly among younger people, and internet and smartphone overuse sit alongside it as a growing concern.
Other behaviours are widely described as addictions even where the formal diagnostic picture is still developing. Sex and pornography addiction, compulsive shopping, food addiction and certain eating behaviours, and compulsive exercise all involve the same pattern of craving, escalation, and loss of control around a behaviour rather than a substance. Whether or not each meets a strict diagnostic threshold, the people experiencing them suffer real harm and benefit from the same kinds of treatment. The common thread is not the specific behaviour but the loss of control over it despite the damage it causes.
What all addictions have in common
Despite the variety, all of these addictions share a recognisable set of features. There is loss of control, with use or behaviour continuing beyond what the person intends and despite repeated attempts to cut down. There is compulsion and craving, a powerful pull toward the substance or behaviour. There is continued use despite harm to health, relationships, work, or finances. For substances, there is usually tolerance, needing more for the same effect, and a withdrawal state when use stops. And there is the way the addiction gradually takes over, crowding out other interests and becoming the organising centre of a person’s life.
These shared features are why addictions are understood as a single family of conditions affecting the brain’s reward and control systems, and why the core of treatment, addressing the underlying drivers, building new coping skills, and providing support, is broadly similar across them even though the specifics differ. It is also why someone with one addiction is at higher risk of another, and why many people in treatment are dealing with more than one substance or behaviour at the same time.
Which are the most dangerous to stop
An important practical point on any list of addictions is that the most dramatic-seeming addiction is not always the most dangerous to stop. Alcohol and benzodiazepines are the two whose withdrawal can be genuinely life-threatening, because abruptly stopping after physical dependence can cause seizures and, with alcohol, delirium tremens. These should never be stopped suddenly without medical help. Opioid withdrawal is severe but rarely fatal on its own, though the overdose risk during use and after a relapse is very high. Stimulant, nicotine, cannabis, and behavioural withdrawals are uncomfortable but not medically dangerous in the same way.
This matters because it determines whether a medically supervised detox is essential. For alcohol and benzodiazepines it is, for safety. For others, detox is about comfort and support rather than preventing a life-threatening withdrawal, though support still greatly improves the chances of getting through it. Knowing which category an addiction falls into is one of the first things a proper assessment establishes, and it is why anyone dependent on alcohol or benzodiazepines should seek medical advice before stopping rather than attempting it alone.
When substance use or a behaviour has become more than occasional
Across this entire list, the line that matters is the same: the point at which a substance or behaviour stops being a choice and becomes something a person cannot control despite the harm it causes. Alcohol use disorder is the clearest everyday example, because alcohol is legal and social, so heavy, harmful drinking can hide as ordinary use for years. The same quiet escalation happens with prescription medications, with cannabis, and with behaviours like gambling that carry no chemical but every other feature of addiction.
If you recognise the pattern in yourself or someone you love, in any of its forms, it is worth seeking help, because every addiction on this list is treatable. Anyone physically dependent on alcohol or benzodiazepines should not stop suddenly, because withdrawal can cause seizures, and should seek medical support first. For other substances and for behavioural addictions, the path is assessment, therapy that addresses the underlying drivers, treatment of any co-occurring mental health condition, and support over time. People recover from all of these, and the earlier treatment starts, the better it works.
Summary
Addictions fall into two broad groups. The main substance addictions are alcohol, opioids, stimulants including cocaine and methamphetamine, prescription stimulants, benzodiazepines, cannabis, nicotine, and hallucinogens and inhalants. The recognised and emerging behavioural addictions include gambling, gaming, internet and smartphone use, sex and pornography, shopping, food, and exercise. What unites them all is that the substance or behaviour hijacks the brain’s reward system, producing loss of control, craving, continued use despite harm, and, for substances, tolerance and withdrawal. Gambling is the most firmly recognised behavioural addiction, and alcohol and benzodiazepines are the most medically dangerous to stop because their withdrawal can cause seizures. Every addiction on this list is treatable, and the right approach depends on the specific addiction and the person.
As Dr. Ponlawat Pitsuwan, addiction medicine specialist at Phuket Island Rehab, puts it, “People are often surprised that gambling sits on the same list as heroin, or that their nightly wine belongs there at all. But once you see that every one of these works on the same reward circuitry and produces the same loss of control, the list stops being frightening and starts being useful, because the same thing that connects them, a treatable brain condition, is also what makes recovery possible for all of them.”
Frequently asked questions
What are the main types of addiction?
Addictions divide into substance addictions and behavioural addictions. Substance addictions include alcohol, opioids, stimulants such as cocaine and methamphetamine, prescription stimulants, benzodiazepines, cannabis, nicotine, and hallucinogens and inhalants. Behavioural addictions include gambling, gaming, internet and smartphone use, sex and pornography, shopping, food, and exercise. All share the same core pattern of compulsive use despite harm driven by the brain’s reward system.
Are behavioural addictions real addictions?
Yes. Behavioural addictions involve the same brain reward system as substance addictions and produce the same craving, escalation, and loss of control. Gambling disorder and gaming disorder are formally recognised in diagnostic systems, and others such as sex, pornography, shopping, food, and exercise addictions are widely described even where the formal picture is still developing. The people affected experience real harm and benefit from the same kinds of treatment.
What is the most dangerous addiction to quit?
Alcohol and benzodiazepines are the most dangerous to quit, because physical dependence on either can cause seizures and, with alcohol, delirium tremens, both of which can be fatal. This is why neither should be stopped suddenly without medical supervision. Opioid withdrawal is severe but rarely fatal on its own, and stimulant, nicotine, cannabis, and behavioural withdrawals are uncomfortable but not medically dangerous in the same way.
Can you be addicted to more than one thing at once?
Yes, and it is common. Because addictions all work on the same reward and control systems, someone with one addiction is at higher risk of another, and many people in treatment are dealing with more than one substance, or a substance and a behaviour, at the same time. Alcohol commonly accompanies other addictions. Effective treatment looks at the whole pattern rather than focusing on a single substance or behaviour.
Is cannabis really addictive?
Yes. Despite a common belief that it is not, cannabis is genuinely addictive, especially in today’s more potent forms. Regular use can lead to cannabis use disorder, with tolerance, an inability to cut down, and a withdrawal syndrome of irritability, anxiety, poor sleep, and craving. The withdrawal is uncomfortable rather than dangerous, so it usually does not require a medical detox, but the dependence is real and treatable.
Are all addictions treatable?
Yes. Every addiction, substance or behavioural, is treatable, and people recover from all of them. Opioid and alcohol dependence have effective medications alongside therapy, alcohol and benzodiazepine dependence require a medically supervised detox for safety, and stimulant, cannabis, nicotine, and behavioural addictions are treated mainly with therapy and support. The right approach depends on the specific addiction and the person, and the earlier treatment begins, the better it works.
Sources
National Institute on Drug Abuse (NIDA). Commonly Used Drugs Charts. https://nida.nih.gov/research-topics/commonly-used-drugs-charts
Substance Abuse and Mental Health Services Administration (SAMHSA). Mental Health and Substance Use Disorders. https://www.samhsa.gov/find-help/disorders
National Institute on Alcohol Abuse and Alcoholism (NIAAA). Understanding Alcohol Use Disorder. https://www.niaaa.nih.gov/publications/brochures-and-fact-sheets/understanding-alcohol-use-disorder
National Health Service (NHS). Addiction: What Is It? https://www.nhs.uk/live-well/addiction-support/addiction-what-is-it/
World Health Organization (WHO). Gaming Disorder. https://www.who.int/news-room/questions-and-answers/item/gaming-disorder
National Institute on Drug Abuse (NIDA). Understanding Drug Use and Addiction. https://nida.nih.gov/publications/drugfacts/understanding-drug-use-addiction
List of addictions — key entities and related terms
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