When someone struggles with addiction, one of the most painful and persistent questions is: why them? Why does one person try alcohol in college and walk away, while another finds themselves unable to stop decades later? Why do addiction and substance use disorders seem to run so strongly in certain families, generation after generation?
The answer, at least in part, lies in genetics. And understanding that science doesn’t just explain the “why”, it removes blame, reframes treatment, and opens the door to more compassionate conversations about one of the most misunderstood conditions in modern medicine.
What Does “Genetics of Addiction” Actually Mean?
Addiction is what researchers call a complex, polygenic condition. That means a single gene doesn’t cause it. It’s influenced by dozens, possibly hundreds, of genetic variants that interact with each other and with your environment.
Studies of twins have been particularly illuminating. When researchers compare identical twins (who share nearly 100% of their DNA) with fraternal twins (who share roughly 50%), they consistently find that identical twins are far more likely to share addiction outcomes (Prescott & Kendler, 1995). This strongly suggests that heredity plays a meaningful role. Estimates suggest genetics accounts for 40 to 60 percent of a person’s risk for developing a substance use disorder (Deak & Johnson, 2021).
That figure doesn’t mean addiction is inevitable if it runs in your family. It means your biological makeup can make certain neural pathways more reactive to substances, certain reward circuits more easily dysregulated, and certain stress-response systems more vulnerable under pressure.
The Role of Brain Chemistry and Reward Pathways
Dopamine, Genetics, and the Drive to Repeat
At the heart of addiction science is the dopamine system: the brain’s primary reward and motivation circuit. When you engage in something pleasurable, dopamine floods the brain’s reward center. Substances like alcohol, opioids, cocaine, and stimulants hijack this system, producing surges of dopamine that far exceed what normal activities generate.
Some people are genetically wired with fewer dopamine receptors, or with receptors that are less sensitive to dopamine. This condition, sometimes called reward deficiency syndrome, means those individuals feel less pleasure from everyday life and may be more drawn to substances that produce an intense, artificial reward.
Variants in genes like DRD2 and DRD4, which govern dopamine receptor function, have been linked to increased addiction risk across multiple studies (Di Ciano et al., 2014). This isn’t a character flaw. It’s a neurobiological reality.
Stress Response Systems and Genetic Risk
Another area where genetics shapes vulnerability is the stress response. The gene FKBP5, for example, regulates how the body responds to cortisol, the primary stress hormone. Certain variants of this gene have been linked to a heightened stress response, which increases the likelihood that a person will reach for a substance to self-regulate when life becomes overwhelming (Malekpour et al., 2023).
People carrying these variants don’t choose to be more reactive to stress. Their nervous systems were built that way. And when early-life trauma enters the equation, childhood neglect, abuse, instability, the genetic risk, and environmental exposure compound each other in ways that dramatically elevate addiction vulnerability.
How Family History Shapes Risk Across Generations
Hollywood Families and the Inheritance of Addiction
Few stories illustrate the multigenerational nature of addiction risk as vividly as those that unfold in the public eye.
Judy Garland and Her Daughters Liza Minnelli and Lorna Luft
Liza Minnelli’s 2026 memoir, Kids, Wait Till You Hear This! gave the world an intimate window into what it meant to grow up as Judy Garland’s daughter. Garland, one of Hollywood’s most beloved entertainers, died of an accidental drug overdose in 1969 at the age of 47 after years of struggle with prescription medications and alcohol.
The memoir reveals how deeply that experience shaped her children’s lives. Minnelli and her sister Lorna Luft became de facto caretakers of their mother from a young age, emptying pill bottles and replacing medications with aspirin in a desperate attempt to protect her. As Minnelli writes, it was “life and death, with no time to learn on the job.”
Both Minnelli and Luft have spoken openly about their own journeys through addiction and recovery. Minnelli has discussed her battles with alcohol and prescription drugs, and the pivotal interventions that eventually helped her find sobriety. Luft, for her part, has been candid in interviews about her own recovery.
What their stories collectively underscore is that growing up in an environment shaped by a parent’s addiction, combined with shared genetic material, creates a layered risk that is both biological and deeply personal.
Greg Allman and His Son Elijah Blue Allman
More recently, Cher has been fighting in Los Angeles Superior Court to establish a conservatorship over her son Elijah Blue Allman, whose struggles with drug addiction have become a matter of public record. Court filings describe a pattern of severe substance use, multiple hospitalizations, and escalating crises.
Elijah is the son of Gregg Allman, the legendary co-founder of The Allman Brothers Band, who battled his own well-documented substance use issues for years before he died in 2017. The generational thread running through the Allman story is striking: a father whose addiction was both celebrated and mythologized by the music industry of his era, and a son whose struggle decades later reflects many of the same biological underpinnings, playing out in a far less forgiving environment.
These families are not uniquely fragile or uniquely flawed. They illustrate something the science has been telling us for years: addiction has roots that go deeper than choices.
Epigenetics: When Environment Changes Gene Expression
The Science of How Life Gets Under the Skin
Genetics isn’t destiny. That’s where epigenetics comes in. Epigenetics refers to changes in how genes are expressed, without changing the underlying DNA sequence, triggered by environmental factors like stress, trauma, substance exposure, and even nutrition.
Research has shown that chronic stress, trauma, and early substance exposure can alter epigenetic markers in ways that affect addiction risk across a lifetime (Lim, 2023). What’s particularly significant is that some of these epigenetic changes can be passed down to future generations through a process called transgenerational epigenetic inheritance. In practical terms, a parent’s addiction may not just transmit risk through the genes they pass on, but it may also transmit changes to how those genes behave.
This is an area of intense and ongoing research, and it helps explain why the children and grandchildren of people with addiction disorders often face elevated risk even when raised in healthy, stable environments.
What Genetics Tells Us About Treatment and Recovery
Precision Medicine and the Future of Addiction Care
Understanding the genetic basis of addiction has real-world implications for treatment. Pharmacogenomics: the study of how a person’s genetics influences their response to medications, is already informing how clinicians prescribe medications like naltrexone (used for alcohol and opioid use disorders), buprenorphine, and methadone.
Some people metabolize these medications differently based on their genetic profile, which means the standard dose may be either insufficient or, in some cases, potentially harmful. Genetic testing is beginning to allow treatment providers nationwide to tailor medication protocols to the individual, improving outcomes and reducing relapse risk.
Beyond medication, genetic risk factors also help clinicians understand why certain therapeutic approaches work better for certain patients. Someone with a highly reactive stress-response system, for example, may benefit more from trauma-focused therapies alongside standard addiction treatment, because addressing the underlying vulnerability is just as important as addressing the substance use itself.
When looking for help, choosing an accredited rehab that offers individualized, evidence-based care, rather than a one-size-fits-all program, can make a meaningful difference in long-term outcomes.
Genetic Risk Is Not a Sentence: It’s a Map
Recovery Is Possible, Regardless of Family History
Perhaps the most important thing genetics teaches us about addiction is this: risk is not destiny. Knowing that you carry a genetic predisposition to addiction doesn’t mean you will develop one. It means you have information. Information that can guide prevention, motivate earlier intervention, and inform treatment choices.
Many people with significant family histories of addiction go on to live in long-term recovery. Many others never develop a substance use disorder at all, despite carrying risk factors. Environment, support systems, early intervention, access to care, and personal agency all interact with genetic vulnerability in ways that science is still working to fully understand.
The emerging picture is one of remarkable complexity and, ultimately, hope. Addiction is not a moral failing. It is not a lack of willpower. It is a condition shaped by biology, environment, early experience, and the ongoing interaction between all three. Understanding the genetics doesn’t reduce human beings to a set of variants. It deepens our respect for how much they are working against, and how much strength it takes to find the path to recovery.
If you or someone you love is navigating addiction, particularly in the context of a strong family history, know that effective, evidence-based help is available. You are not defined by your genes. You are capable of change, and you don’t have to do it alone.
Sources
- Deak, J. D., & Johnson, E. C. (2021). Genetics of substance use disorders: a review. Psychological medicine, 51(13), 2189–2200. https://doi.org/10.1017/S0033291721000969
- Di Ciano, P., Grandy, D. K., & Le Foll, B. (2014). Dopamine D4 receptors in psychostimulant addiction. Advances in pharmacology (San Diego, Calif.), 69, 301–321. https://doi.org/10.1016/B978-0-12-420118-7.00008-1
- Freydkin, D. (2026, March 10). 11 things we learned from Liza Minnelli’s memoir. AARP. https://www.aarp.org/entertainment/books/liza-minnelli-memoir
- Lim, C.-J. (2023, December 29). Cher files conservatorship request over son Elijah Blue Allman’s finances, citing substance abuse. NBC News. https://www.nbcnews.com/pop-culture/pop-culture-news/cher-files-conservatorship-son-elijah-blue-rcna340851
- Malekpour, M., Shekouh, D., Safavinia, M. E., Shiralipour, S., Jalouli, M., Mortezanejad, S., Azarpira, N., & Ebrahimi, N. D. (2023). Role of FKBP5 and its genetic mutations in stress-induced psychiatric disorders: an opportunity for drug discovery. Frontiers in psychiatry, 14, 1182345. https://doi.org/10.3389/fpsyt.2023.1182345
- Prescott, C. A., & Kendler, K. S. (1995). Twin Study Design. Alcohol health and research world, 19(3), 200–205.
- Winter, J. J., Rodríguez-Acevedo, K. L., Dittrich, M., & Heller, E. A. (2023). Early life adversity: Epigenetic regulation underlying drug addiction susceptibility. Molecular and cellular neurosciences, 125, 103825. https://doi.org/10.1016/j.mcn.2023.103825