Personality Profiles of Individuals with Substance Use Disorders: Historical Overview and Current Directions

Jeffrey S. Nevid*, Alexander J. Gordon, Andrew S. Miele, Luke H. Keating

St. John’s University, New York

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Abstract

Efforts to understand personality features of people who use psychoactive substances have a long history, dating back to early psychoanalytic conceptualizations. Advancements in the field have focused on applying multidimensional personality inventories to better understand personality differences between substance users and non-users, and between different substance use types, with respect to both psychopathological traits and broad dimensional factors. A brief review of this evidence highlights personality features of persons with alcohol and other substance use problems and between users of different types of substances, especially alcohol and opioid substance use disorder patients. A better understanding of personality profiles of substance use disorder groups may be useful in tailoring treatment approaches based on profile characteristics.

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Medical and psychological research literature documents a long history of attempts to identify and characterize personality profiles associated with problematic substance use. Approaches to this question have varied, utilizing objective, projective, dimensional, and categorical measures of personality as well as psychoanalytic formulation of substance use behavior. Studies initially focused on examining evidence for the existence of an “alcoholic” or “addictive” personality structure that may predispose individuals to engage in problematic alcohol and drug use.

Research efforts have shifted away from attempts to identify an overriding concept of a single personality type¹. More recent work seeks to develop etiologic predictive models that identify and compare personality profiles of users and nonusers and between users of different substances. Furthermore, these newer approaches have increasingly used more complex and integrative models incorporating both biological and socioeconomic factors. The current paper provides a brief narrative review of research evidence exploring personality profiles of individuals with substance use disorders as well as differences in personality traits among users of different substances. Understanding differences in personality patterns may help inform targeted intervention efforts to address personality-level factors that underpin substance use and risk factors in substance use disorders, which may differ among individuals who use different substances.

Psychoanalytic Approaches

Early psychoanalytic approaches emphasized drives toward libidinal gratification and defenses against aggressive impulses as the basis for addiction and substance use^2-4. Moreover, fixation at the oral stage of psychosexual development was thought to lead to development of oral-dependent personality traits, such as dependence and depression, as well as to behavioral patterns in adulthood aimed at oral gratification, such as excessive drinking or smoking.

Although persons who develop alcohol use disorder or other forms of substance misuse may show dependent traits, it remains unclear whether dependence leads to alcoholism or stems from downward movement in social status associated with problem drinking, largely as a result of unemployment, which likely renders people more dependent on others. Nor does demonstrating a statistical association between dependence and alcoholism establish that alcoholism represents an oral fixation or can be traced to problems in early psychosexual development. It is noteworthy that later psychodynamic models of personality functioning of substance users put a greater emphasis on deficits in ego strength and self-regulation driving efforts toward self-medication of emotional distress⁵. More recently, there has been a shift in focus from understanding personality dynamics in substance use to using objective personality inventories to identify personality profiles associated with substance use and substance use disorders. Moreover, contemporary researchers have focused more attention on comorbidity between personality disorders and substance use disorders.

Personality Profiles

Researchers have consistently demonstrated links between substance use and diagnoses of borderline and antisocial personality disorders^6-9. Although antisocial personality disorder is often associated with patterns of drug use and misuse, debate has centered around its lack of specificity in predicting substance use behavior due to the high rates of antisocial personality features among non-users¹⁰. In part due to the predictive limitations of diagnosis-level information, a growing body of literature has favored trait-level dimensional conceptions of personality in developing personality profiles of individuals with substance use disorders.

The MacAndrew Alcoholism Scale (MAC) of the Minnesota Multiphasic Personality Inventory (MMPI) is an early notable example of a dimensional approach to measurement of personality traits used to predict problematic substance use potential¹¹. The scale was developed using 44 items from the original version of the MMPI that, although not related to drinking behaviors per se, were differentially endorsed by alcohol users as compared to normative samples. Although originally developed to predict proneness to alcoholism, studies have found the MAC to be nonspecifically associated with use of other substances, such as opioids, as well as with markers of addictive behaviors related to problem eating behaviors (i.e., obesity, anorexia)^12,13. Factor analysis of the MAC delineated six subscales: Risk Taking, Cognitive Impairment, School Maladjustment, Interpersonal Competence, Extroversion and Exhibitionism, and Moral Indignation¹¹. High scores on the MAC are related to impulsivity, issues with authority and antisocial tendencies, and extraversion, representing a substrate of personality traits often associated with problem drinking and other problematic substance use¹⁴.

Cloninger’s (1987)¹⁵ tridimensional model of personality has been particularly influential in the development of etiological models identifying personality patterns in substance use populations. Each dimension of the model (novelty-seeking, harm-avoidance, and reward-dependence) has been demonstrated to be predictive of later substance use based on childhood measures¹⁶. Cloninger’s typology of alcoholism subtypes provides a useful heuristic framework for distinguishing different alcoholic types based on substance use behaviors, underlying biological processes, and distinguishing personality features. The type I alcoholic personality, which is associated with use of alcohol as self-medication and an anxious or neurotic personality profile, is frequently characterized by low novelty seeking (NS), high harm avoidance (HA) and high reward dependence (RD)¹⁷. The type II alcoholic personality, described in terms of antisocial personality features and characterized by impulsivity, is often associated with the opposite personality profile (high NS, low HA, and low RD).

Other researchers also emphasize heterogeneity within populations of individuals with substance use disorders. For example, Babor and colleagues¹⁸ conducted a cluster analysis with a sample of individuals with alcohol use disorder. Their findings showed two definable clusters having distinct risk factors, personality profiles, and course of disease. Other researchers have explored dimensional factors relating to substance use, converging on a profile characterized by high levels of impulsivity and disinhibition and negative emotionality^19-22,25,58. These constructs have been linked to several aspects of substance misuse, including severity of dependence, age of onset, and substance use etiology²¹. Applying a five-factor model, levels of alcohol involvement are frequently associated with low levels of conscientiousness, agreeableness, and high levels of neuroticism^22,23. These traits are in line with earlier research on etiological models of alcohol use¹⁶. Researchers have also adopted an integrative, multidimensional view of personality traits associated with substance use^24,25. For example, investigators incorporated biological correlates and gene-environment interactions that contextualize personality and substance use behavior^26,27.

Multidimensional personality inventories have been introduced that better capture a wider range of personality traits in relation to substance use disorders, including inventories such as Multidimensional Personality Questionnaire (MPQ) and the Personality Assessment Inventory (PAI). For example, our research groups used multidimensional personality inventories to examine psychopathological personality traits in substance use disorder groups²⁸.

Research in personality psychopathology has also identified clusters of traits associated with antisocial and borderline personality disorders as risk factors for future alcohol use²⁹. Across studies and types of substances, researchers find that problematic substance use is highly comorbid diagnostically with personality disorders in general, and with antisocial and borderline personality traits in particular³⁰.

Lower-level trait analyses allow for a richer and more complex personality architecture to emerge³¹. For example, disinhibited behavior can be represented in terms of two distinct, yet related, components: impulsivity and sensation-seeking³². Each of these trait components has been related to substance use etiology and outcomes and are often treated as separate, subordinate traits in research studies³³. More research is needed using hierarchical models that incorporate multimodal assessment of both clinical and nonclinical personality traits³⁴.

Studies focusing on lower-order traits find personality-specific relations between facets of neuroticism, specifically hopelessness and anxiety-sensitivity, and disinhibition, which is typically described in terms of impulsivity and sensation-seeking³². A study of personality traits relating to motives to drink found that factors such as anxiety-sensitivity and feelings of hopelessness were uniquely correlated with motives to use substances to self-medicate and reduce negative affect²⁴.

A study applying the five-factor model (FFM) identified similarities in personality traits across subgroups of users of cocaine and heroin³⁵. MANCOVA analysis was conducted with user-status as an independent variable, demographic factors as covariates, and personality traits as dependent variables. The results indicated that across user subgroups, users tended to score high on measures of neuroticism and low on conscientiousness. In a meta-analysis of current marijuana users, pooled effect size estimates showed users scoring low on agreeableness and conscientiousness, yet while also reporting average levels of neuroticism and high levels of openness to experience³⁶.

More recently, investigators examined prescription drug use among young adults between the ages of 18 and 26, using latent profile analysis to identify different risk strata within this population³⁷. Comparisons of mean differences between latent groups on responses to addiction scales identified distinct patterns of personality traits. While anxiety-sensitivity was associated with use of sedatives and sensation-seeking was linked to stimulant use, impulsivity was related to misuse across all types of prescription medications.

Biobehavioral and Developmental Models

Explanations for relations between disinhibition and substance use have also begun to incorporate integrative, developmental models. Cloninger’s model was the first to propose that genetic predisposition may link substance use and personality traits, a claim which subsequent research has supported²⁷. Significant overlap has been found between genetic variance and personality traits linked to substance use, such as behavioral control and agreeableness^26,34.

Extensive research on risk factors for substance use beyond personality profiles has been conducted across different groups of users, both in specific samples (e.g., college-age drinkers) and representative samples (e.g., national comorbidity surveys). Overall, support for demographic risk factors has been equivocal³⁸. For example, studies have shown that males tend to have a higher prevalence of drinking behavior than females³⁹. Meanwhile, the observed racial differences in drinking behavior are often attributed to socioeconomic factors, such as income and education, and availability of substances rather than differences in race alone^40,41.

Equally important as individual risk factors, then, may be the developmental context in which personality operates and substance use patterns form. The impact of this pathway can be studied in terms of environmental self-selection, or the ability of individuals to shape their environments in ways that match their personality⁴². A longitudinal study of self-selection into Greek life and problem drinking among college students found both direct and indirect effects of personality traits on drinking behaviors. Using a latent growth model, the researchers found direct effects of personality and drinking behaviors were demonstrated by individuals with higher levels of extraversion tending to self-select into Greek life—a college lifestyle associated with high-risk drinking—even after controlling for levels of pre-college drinking. Alternatively, higher neuroticism predicted pre-college drinking and subsequent entrance into fraternities or sororities⁴². These results point to the interplay between personality and environmental influences in the development and maintenance of problem drinking.

Comparisons of Personality Traits of Substance Users and Non-Users

Researchers report distinct profiles of personality traits in comparing substance users and non-users⁴³. With respect to general dimensions of personality, substance users tend to display elevated levels of reactivity, negative affect, and novelty-seeking. In terms of personality pathology, drug users tend to display elevations in antagonism, disinhibition, and psychoticism as compared to non-users. Furthermore, these personality trait patterns are often associated with diagnoses of borderline and antisocial personality disorders, classifications frequently comorbid with substance use disorders⁴³.

Personality profiles of users of substances other than alcohol are characterized primarily by low levels of conscientiousness, with equivocal support for the role of other traits⁴⁴. Relations between personality traits and nicotine use reveal a similar profile to that of alcohol use, with low conscientiousness, low agreeableness, and high neuroticism emerging as the strongest predictors of smoking behavior²³.

Personality Trait Comparisons of Users of Different Types of Substances

While research evidence on differences in personality traits among users of different types of substances is diverse with respect to the personality constructs measured and substance types compared, the literature can be distinguished in terms of analyses of clinical or pathological personality traits (e.g., MMPI, PAI, diagnostic scales) and more general or normative personality dimensions, such as those represented by “Big Five” model traits. The most common comparisons are those involving individuals with alcohol and opioid (typically heroin) use disorders.

Comparisons Based on Psychopathological Personality Traits

An early MMPI study used discriminant function analysis to compare personality functioning of alcohol and heroin users admitted to an inpatient unit, finding that alcohol users exhibited a profile more consistent with neurotic features than did opioid users⁴⁵. This profile comprised syndromes such as anxiety, depression, and somatization. Opioid users, however, demonstrated higher levels of defensiveness, activity, and ego strength, presenting with more self-confidence and mood stability, but with the presence of features related to social deviance (e.g., egocentricity, nonconformity, and impulsivity). While a degree of social deviance was apparent for both groups, these traits were predominate among opioid users.

Evidence also indicates that among users admitted for inpatient treatment of substance use problems, those who misuse opioids are more likely to exhibit externalizing symptoms and personality disorders than those who misuse alcohol or marijuana. For example, Hopwood, Baker, and Morey (2008)⁴⁶ used exploratory factor analysis, finding that among inpatients in a substance use treatment program, heroin and cocaine users exhibited higher levels of externalizing symptoms on the PAI (predominantly antisocial behavior) than did control, alcohol, or marijuana groups. In contrast to the earlier work of Sutker and colleagues⁴⁵, Hopwood’s group found that heroin and cocaine groups also scored higher on an internalizing factor (predominantly depression and anxiety) than did controls or alcohol or marijuana groups. Using discriminant function analysis, our research group found similar results with the PAI, showing that opioid use disorder patients had higher levels than alcohol use disorder patients on both internalizing (i.e., anxiety, anxiety-related disorders) and externalizing (antisocial and borderline features) pathology⁴⁷. We also found that opioid patients scored higher on suicidal ideation than alcohol patients, although their scores on average were not clinically elevated. The net result of these recent studies is to raise awareness of more extensive internalizing and externalizing pathological traits in opioid use disorder patients.

Supporting the more profound personality pathology in opioid patients, researchers have also noted that opioid and other drug users are more likely to meet criteria for clinical diagnosis of borderline, antisocial, dependent, and narcissistic personality disorders as compared to alcohol users^29,48,49. Despite this trend, some researchers find little evidence to distinguish alcohol and opioid users in terms of early maladaptive schemas originating from adverse childhood experiences⁵⁰.

Lending more support to these differences, an early MMPI study used discriminant function analysis to compare personality traits in different types of substance users, showing that alcohol users tended to be least disturbed when compared to cocaine, heroin, and polysubstance users, with the latter groups exhibiting the most severe dysfunctional personality traits, including paranoia, withdrawal, and anxiety⁵¹. These investigators also distinguished heroin users as more depressed and alienated in contrast to cocaine users who showed disturbed personality traits primarily characterized by impulsivity.

Comparisons Based on General Personality Dimensions

Research applying Cloninger’s model and using logistic regression analysis showed that while both alcohol and opioid dependent patients in residential treatment tended to score high on Novelty-Seeking, opioid users were significantly more extreme on this trait⁴⁸. When compared to those with alcoholism, opioid users also exhibited higher levels of self-transcendence but lower levels of harm avoidance. Two profiles emerge from this work, one comprising easily bored, exploratory, stimulus-seeking opioid users and a second comprising more emotionally vulnerable alcohol users seeking relief from negative emotions.

Several research efforts focusing on impulsivity using the Barratt Impulsiveness Scale Version 11⁵² found no meaningful differences between alcohol and opioid users, although both groups had higher levels of impulsivity than controls^53,54. Using logistic regression, one of these studies suggests that different domains of impulsivity may better characterize different substance use types, as alcohol users were distinguished from controls on motor impulsivity, whereas opioid users were distinguished on non-planning impulsivity⁵³. This, too, is consistent with distinctions between stimulus-seeking (opioid) versus vulnerable and anxious (alcohol) users.

Discount rates, which represent the degree of reduced value due to a delay in receiving a reward, have also been used in the literature as a proxy for impulsiveness. Research along these lines shows that although heroin and cocaine users do not tend to differ from each other in discount rates, they both tend to exhibit higher discount rates (lower reward value for a longer delay) than alcohol users⁵⁵.

Research applying Big Five personality traits shows that alcohol users tend to be lower on extraversion than other substance use groups, indicating a more reserved personality and less social connectiveness⁵⁴. Other investigators find that alcohol and polydrug users do not differ significantly on levels of neuroticism and openness to experience; however, polydrug users tend to score lower than non-users on conscientiousness and agreeableness while alcohol users do not⁵⁶. These investigators also found that polydrug user profiles were more consistent with antisocial personality disorder than were those of alcohol users, with higher levels of Sensation-Seeking, Disinhibition, Experience Seeking, and Thrill and Adventure Seeking.

Other researchers applied the three higher-order personality dimensions of the Multidimensional Personality Questionnaire (MPQ) as a proxy for the Big Five traits⁵⁷. This research showed that substance users tend to differ the most on constraint, which corresponds to Big Five factors of (high) conscientiousness and (low) openness to experience. Alcohol users showed higher levels of constraint than did opioid users, and alcohol and marijuana users combined showed higher levels of constraint than opioid and cocaine users combined. Constraint also shared a negative relationship with a diagnosis of antisocial personality disorder, a finding consistent with other research that personality disorders and psychopathy are more prevalent among opioid users.

One of the limitations in examining personality differences among substance use types is the confound of age. Alcohol users in addictions research tend to be older than those who use other drugs, prompting some researchers to control for age while others accept the age differential on grounds of ecological validity because it represents typical patterns in the general population^57,45-47.

The current review utilizes a narrative approach to examining historical, methodological, and theory-based development and current trends related to investigating personality profiles of individuals with substance use disorders and personality differences based on substance of choice. We recognize that a limitation of this approach is the difficulty of synthesizing a large body of research that reflects different perspectives from different time periods in the field’s history as well as the diversity in demographic characteristics of the populations studied.

In summary, evidence presented in this review bears on differences in personality traits between substance users and nonusers and among different types of substance use types. An important clinical implication of research on differences between substance use types is the understanding that a “one-size-fits-all” approach should not be used as a guide to treatment. Evidence of personality differences relating to different substance use types, especially the more severe levels of pathological personality traits generally found among opioid users, supports the need to take personality differences into account as a guide to individualize treatment in the interest of targeting clinical improvement.

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