Prior studies suggest that TikTok users vary in their engagement behaviors, including passive viewing, participatory interaction, and content creation, and exhibit varying levels of problematic-use risk. Yet it remains unclear which combinations of these engagement behaviors correspond to higher versus lower risk, and which psychological vulnerabilities contribute to high-risk patterns. In a two-wave study of 715 Chinese young adults, we applied latent profile analysis (LPA) to problematic TikTok use and the frequency of passive viewing, participatory, and contributory behaviors at Time 2. We then used multinomial logistic regression with the three-step method to prospectively examine how Time 1 measures of psychopathology and related affective/cognitive vulnerabilities, including depression, social anxiety, life satisfaction, emotion dysregulation, and boredom proneness, predicted TikTok profile membership. Four profiles emerged: Minimal Users (6.7%), Passive Watchers with High Problematic Use Tendencies (38.0%), Moderate Users with Mild Problematic Use Tendencies (42.4%), and Active Users with Low Problematic Use Tendencies (12.9%). Greater life satisfaction, lower social anxiety, and lower boredom proneness at baseline predicted membership in the Active rather than Passive, Moderate, or Minimal profiles. Greater emotion dysregulation predicted membership in the Passive rather than Moderate profile. These findings highlight substantial heterogeneity in TikTok use and suggest that higher baseline psychological wellbeing may increase the likelihood of more active and less problematic patterns of engagement. The current study extends prior LPA research by specifying how risk manifests in everyday use, identifying contributors to high-risk profiles, and extending empirical support for the I-PACE theoretical framework of Internet use disorders.

Problematic Internet Use (PIU) has been associated with emotional difficulties in childhood and adolescence. However, the directionality of this relationship remains unclear due to the lack of terminological consensus and wide variability in prevalence estimates. This systematic review aims to synthesize the longitudinal evidence on the directionality of the relationship between emotional variables (depression, anxiety, emotional dysregulation) and PIU in children and adolescents.

Attention-Deficit/Hyperactivity Disorder (ADHD) is overrepresented in patients with addictive disorders but remains underdiagnosed. This comorbidity complicates clinical presentations and worsens prognosis. We aimed to evaluate addictive disorder outcomes six months after ADHD diagnosis in patients undergoing addiction treatment and to identify factors associated with a favorable outcome. Secondary objectives explored patient characteristics and therapeutic strategies.

Professional societies recommend that adolescents with opioid use disorder (OUD) receive medication for opioid use disorder (MOUD). This cross-sectional study examined the association between adolescent specialty treatment episodes for OUD with planned MOUD use compared to adults over time.

The REpeated-dose Behavioral intervention to reduce Opioid Overdose Trial (REBOOT) evaluated motivational interviewing for overdose prevention, focusing partly on witnessed overdose response. We assessed participants' witnessed overdose history and REBOOT's impact on overdose response among opioid overdose survivors using non-prescribed opioids in Boston and San Francisco.

With the global rise in smartphone use, problematic smartphone use (PSU) has emerged as a critical mental health concern. While reinforcement pathology theory posits that a high expected value of alternative behaviors (EVAB; e.g., psychological rewards from social or physical activities) may mitigate addictive tendencies, no prior study has examined this hypothesis in daily life contexts. This study is the first to investigate the within-person dynamics of EVAB on PSU and its underlying mechanisms. Using ecological momentary assessment (EMA), 72 participants (M = 19.01 ± 0.93 years; 40 females) completed baseline measures of episodic future thinking (EFT) followed by 14 days of intensive longitudinal data collection (three daily reports), assessing EVAB, delay discounting, PSU, and screen time. Dynamic structural equation modeling (DSEM) revealed two key findings: First, momentary increases in EVAB predicted subsequent reductions in both PSU levels and screen time, mediated by decreased delay discounting (β = -0.032, HPD 95 % CI = [-0.051, -0.014]). Second, individual differences in EFT detail/vividness and mental imagery positively predicted daily EVAB, which in turn reduced PSU via lower delay discounting (β = -0.015, HPD 95 % CI = [-0.026, -0.006]; β = -0.012, HPD 95 % CI = [-0.022, -0.004]). These results provide the first empirical support for core hypotheses of reinforcement pathology theory in PSU research, elucidating the dynamic role of EVAB while offering novel theoretical and clinical insights. The findings emphasize that PSU interventions should target both within-person fluctuations in reinforcement valuation and between-person differences in future-oriented cognition.

Sociodemographic disparities in SUD treatment need and receipt among women inform public health initiatives. While rates of SUD among pregnant women are lower than those who are not pregnant, an investigation of whether and how sociodemographic disparities of SUD treatment need and receipt among pregnant women can further accelerate SUD related risk prevention for both mothers and babies.

To assess the feasibility of recruiting new mothers (0-12 months postpartum) who use cannabis through social media and conducting a mixed-methods study to characterize their cannabis use. This pilot study aimed to gather preliminary data on use motives, behaviors, and objective toxicology to inform future large-scale research.

Substance use is commonly documented among human trafficking (HT) survivors in emergency department (ED) settings. Multiple substance use disorders (poly-SUD) are associated with poor health and psychosocial outcomes. This study identified latent classes and demographic covariates of HT-related ED visits by the types of SUDs documented in survivors' medical records.

Problematic social media use (PSMU) is increasingly conceptualized as a behavioral addiction involving attentional bias toward social media icons. Although fear of missing out (FoMO) contributes to PSMU maintenance, its dynamic interactive role in attentional bias dynamics remains unclear. Guided by the I-PACE model and attentional bias theory, this study examined whether and when FoMO modulates gaze-based attentional bias toward social media icons in PSMU. 912 university students completed online screening for PSMU and FoMO; 55 meeting PSMU criteria (M = 19.60) were categorized into high- or low-FoMO groups. Participants performed a visual dot-probe task with social/non-social app icons while eye-tracking recorded gaze behavior across four 500 ms time windows. Results revealed FoMO significantly interacted with attentional bias in two critical phases: During early processing (0-500 ms), the PSMU/high-FoMO group exhibited attentional orienting deceleration to social media icons, whereas PSMU/low-FoMO showed attentional maintenance. In later processing (1000-1500 ms), PSMU/high-FoMO demonstrated attentional vigilance-maintenance, while PSMU/low-FoMO displayed avoidance. These findings indicate FoMO exerts a temporally dynamic interaction effect on attentional bias in PSMU-characterized by initial orienting delays followed by sustained attentional engagement with social media icons. This supports reconceptualizing FoMO as a core psychological mechanism that reinforces PSMU through biased attentional dynamics, advancing theoretical alignment with the I-PACE framework.

Problematic social media use (PSMU) has been associated with negative effects such as depression and anxiety across different countries and cultures. However, research on specific symptoms of PSMU and its correlates across nations remains limited. The present study aimed to compare the relationships of PSMU, boredom proneness, and psychological distress symptoms in China and Japan using network analysis. Questionnaire surveys were conducted among undergraduates in China and Japan. Participants included 822 students in China (mean age = 18.36, SD = 0.80) and 698 in Japan (mean age = 19.66, SD = 2.16). Network analysis was employed to estimate the symptom network structures, identify the most central symptoms, and compare the networks across the two countries. Results show that the core PSMU symptoms were Craving/tolerance in China and Relapse/loss of control in Japan. In the comorbidity networks, the most influential symptoms in China were agitation, panic, frequent inactivity, and downheartedness. The most central ones in Japan were not looking forward, downhearted, touchy, and a pervasive lack of motivation. The present study improves understanding of the links between symptoms of PSMU, boredom proneness, and psychological distress in both countries, which can be helpful for the development of potential nationally specific interventions.

Examining why adolescents and young adults post or delete alcohol-related content on social media has important implications for understanding and mitigating the influence of alcohol-related social media content on alcohol cognitions and use. This longitudinal study explored motives for posting and deleting alcohol content and their association with actual posting and deleting one month later. Survey data were collected from 306 adolescents and young adults recruited as part of a longitudinal experimental study examining alcohol-related content on social media and alcohol norms and use. Participants aged 15-20 (M = 18.39; SD = 1.32) indicated the top three motives for posting alcohol content: prove they were having fun, show they have an active social life, and make themselves look cool. The most endorsed motives for deleting alcohol-related social media content included: it being unflattering, feeling embarrassed, or fear of others sharing it. After controlling for relevant covariates, a negative binomial regression indicated that at baseline, alcohol-related posting motives related to making others jealous, posting about most things, and doing what friends do were significantly and positively associated with frequency of posting alcohol-related content one month later. Further, results of a linear regression indicated that the only baseline motive significantly associated with frequency of deleting alcohol-related content at 1-month follow-up was finding the content unflattering. Overall, results suggest that there are unique motives associated with both posting and deleting alcohol-related content on social media, which has implications for preventative interventions aiming to reduce alcohol-related social media behavior.

Given increased rates of problematic alcohol use among middle-older age adults, novel, accessible alcohol interventions are needed. This pilot RCT explored the feasibility, acceptability, and preliminary effectiveness of personalised smartphone-delivered alcohol approach bias modification (ApBM) in Australians (≥55 years) drinking at hazardous/harmful levels (AUDIT ≥ 8).

No previous studies have ever examined humor as a diffusion strategy in the context of technology use. The present study is the first to investigate whether meta-inner humor beliefs (MIHBs) are prospectively associated with problematic social media use (PSMU) via metacognitions about social media use. A prospective, two-wave longitudinal design with a bidirectional cross-lagged panel (CLPA) model was used to examine associations between adaptive and maladaptive MIHBs on PSMU, examining the indirect pathway of positive and negative metacognitions about social media use (meta-SMUs). The study was conducted across two waves at a six-month interval. At Wave 1, a large community sample (N = 1,253; 58.2 % females; age = 36.8 years [SD ± 14.1]) participated in the study, and at Wave 2, 78.1 % of the starting sample completed the follow-up assessment. Results from the bidirectional CLPA showed that adaptive MIHBs at Wave 1 were significantly associated with lower negative and positive meta-SMUs at Wave 2. In contrast, maladaptive MIHBs were only associated with higher negative meta-SMUs at Wave 2. Also, negative meta-SMUs predicted an increase in PSMU six months later, whereas it was non-significant for positive meta-SMUs. Analyses of bidirectional indirect pathways demonstrated that adaptive MIHBs were indirectly related to lower PSMU through reduced negative metacognitions, while maladaptive MIHBs were indirectly related to higher PSMU through elevated negative metacognitions. Multi-group analyses established full longitudinal measurement and structural invariance across gender. The findings underscore the potential role of humor-related metacognitive pathways in the maintenance of PSMU, suggesting that humor-based psychotherapeutic approaches warrant further investigation.

Many individuals turn to religion in their efforts to deal with difficult times in their lives, and research has consistently linked indices of religious coping to measures of health and well-being. The Brief Religious Coping Scale (Brief RCOPE) is the most commonly used measure of religious coping in the literature; however, relatively little has been reported about the psychometric properties of the brief version. Moreover, the examination of this scale among individuals with a substance use disorder (SUD), a disorder highly associated with major life stressors for which religious coping may serve as a principle form of coping, has been largely overlooked. Therefore, the current study sought to examine the psychometric properties of the Brief RCOPE in a sample of 1290 adults undergoing residential treatment for SUD. Results from confirmatory factor analyses supported the theorized two-factor structure of positive (PRC) and negative (NRC) religious coping, as well as measurement invariance across sex and across time. Validity was established through significant, differential associations between PRC and NRC at pre-treatment and a range of psychosocial outcomes at pre- and post-treatment. This study provides evidence that the Brief RCOPE is a reliable and valid tool for assessing religious coping among adults with SUD. Its strong psychometric performance supports its potential for use in clinical settings to help clinicians understand and address patients' spiritual experiences in recovery.

Craving is a key challenge in treating methamphetamine use disorder (MUD). The memory reconsolidation theory indicates that interference with MUD after drug memory retrieval helps to reduce craving. Previous studies have demonstrated the importance of the hippocampus in memory consolidation, but traditional non-invasive interventions cannot effectively locate and intervene in the hippocampus. Although tTIS can accurately intervene in deep brain regions, it is still unknown whether tTIS intervention on the MUD hippocampus is effective in reducing craving.

This study examines how LGBTQ+ identities, chemsex experiences, and digital misogyny intersect and are discursively negotiated within Anglophone Reddit spaces. Adopting an integrative mixed-methods design, it analyzes 509,327 posts and comments drawn from four LGBTQ+ -oriented subreddits through semantic co-occurrence mapping, sentiment and subjectivity profiling, lexical diversity metrics, and qualitative thematic coding. The analytical framework connects three mutually constitutive axes-identity performance, affective discourse, and platform/algorithmic dynamics-to capture how individual narratives are shaped by both cultural hierarchies and sociotechnical infrastructures. Findings show that identity expressions cluster around themes of community belonging, family disclosure, and self-recognition, while trans and nonbinary users remain disproportionately exposed to hypersexualization and digital exclusion. Chemsex discourse is predominantly marked by negative affect-loneliness, shame, and stigma-but also includes solidarity and harm-reduction dialogue, revealing ambivalent forms of care within digital queer cultures. Digital misogyny and algorithmic silencing appear as layered phenomena, manifesting both in external harassment and intra-community norm enforcement. The study contributes theoretically by integrating critical chemsex scholarship with digital queer theory, demonstrating that affective harm is simultaneously interpersonal and infrastructural. Methodologically, it adapts a transparent computational-qualitative triad suitable for analyzing large-scale online discourse. Practically, the results inform platform governance (bias audits, transparent moderation) and public health communication (embedding community-based, empathetic language in harm-reduction outreach). While limited to English-language Reddit data, the framework offers transferable insights into how LGBTQ+ users negotiate vulnerability, resilience, and belonging in digital environments.

Data from real-world e-cigarette (EC) flavor bans suggest that such bans may increase combusted cigarette (CC) use. However, experimental data are needed to better understand how EC characteristics affect EC appeal and CC use.

Numerous studies have examined the relationship between social support and problematic social media use; however, findings are inconsistent. Hence, this study employed a three-level meta-analysis to clarify the relationship between social support and problematic social media use. Additionally, a meta-analysis was conducted to examine the relationship between online social support and problematic social media use and to identify potential moderators of this relationship. After searching and screening the literature, this meta-analysis included a total of 65 studies, with 235 effect sizes and 52,738 participants. The results showed a negative correlation between social support and problematic social media use (r = -0.178, p < 0.001), and a positive correlation between online social support and problematic social media use (r = 0.399, p < 0.001). Age and educational stage significantly moderated the association between social support and problematic social media use. Online social support measurement and problematic social media use measurement significantly moderated the association between online social support and problematic social media use. It is suggested that treatment for problematic social media use should attend to individuals' levels of social support and online social support.

Behavioral economic alcohol demand, or the reward value of alcohol consumption, consistently shows associations between alcohol use and alcohol use disorder (AUD) in adults, yet research within clinical youth populations (considered to be ages 15-24) remains limited. It is critical to better understand how demand functions in clinical youth populations to predict alcohol related outcomes. Moreover, given the narrowing gap between male and female youth in alcohol use prevalence in recent years, exploring sex differences in alcohol demand and its role in the relationship between demand, alcohol use, alcohol-related problems, and AUD is important. The current study used data from two samples of adolescents and young adults from the community (N = 127; ages 16-25, M = 20.57, SD = 2.27; 56.35 % female; 91.27 % white), one treatment seeking (n = 94) and one non-treatment seeking (n = 33), to examine the relationship between demand indices and alcohol use outcomes and to explore the role of sex in these relationships. Demand intensity (the number of standard drinks a person would consume if drinks were $0), O (maximum money spent across prices, i.e., number of drinks purchased × price), and price sensitivity (α; the rate alcohol consumption decreases as prices increase) were significantly associated with alcohol use quantity and frequency outcomes, but not alcohol-related problems or AUD severity. Although male youth had significantly greater intensity relative to female youth, intensity was more strongly associated with drinking days in female youth. Broadly, our findings support the importance of evaluating alcohol demand in clinical youth as well as sex differences in alcohol demand. Our results also speak to the need for interventions targeting sex-specific mechanisms and moderators of alcohol use.

Some college women report using electronic cigarettes (e-cigarettes) for weight control. Social media frequently promotes e-cigarettes for weight management and reinforces unrealistic body ideals, which may foster body dissatisfaction and unhealthy weight control behaviors. Given college women's high rates of social media and e-cigarette use, this study examined the relationship between college women's social media use, thin-ideal internalization, and e-cigarette use for weight control.

Problematic smartphone use (PSU) has been associated with withdrawal-like symptoms and altered intrinsic neural activity (INA). While previous studies suggest that PSU affects brain function, little is known about how INA is modulated by smartphone restriction. This longitudinal fMRI study investigated group- and time-dependent changes in resting-state INA following short-term smartphone deprivation. 36 participants (aged 18-29; 22 female) were categorized into PSU (n = 19) and non-PSU (n = 17) groups using the Smartphone Addiction Scale-Short Version (SAS-SV). Resting-state fMRI scans were obtained before and after a 72-hour period of smartphone restriction. Psychometric measures included the Mannheim Craving Scale (MaCS) and the Smartphone Addiction Inventory (SPAI). A significant group-by-time interaction revealed INA changes in the left inferior frontal gyrus, bilateral posterior cingulate cortex, right middle frontal and precentral gyri, and left calcarine cortex. INA increased over time in the non-PSU group but decreased in the PSU group in prefrontal and cingulate areas. In contrast, sensorimotor and occipital regions showed increased INA over time in PSU individuals. Associations between neural activity and MaCS scores indicated that greater craving was linked to reduced INA in the posterior cingulate cortex. Within the PSU group, higher smartphone-use severity, as measured by the SPAI, was associated with altered INA in occipital, parietal, and cerebellar regions. These findings suggest PSU is linked to distinct and state-dependent neurofunctional alterations that may reflect withdrawal-related processes and maladaptive reward and cognitive control mechanisms.

With recent rise in nicotine and cannabis vaping and growing evidence of their negative health effects, especially when co-vaped, understanding vaping patterns is important. This study examined national prevalence and factors associated with nicotine and cannabis vaping among U.S. emerging young adults.

Internet addiction and attention control increasingly influence how individuals across age groups perceive social support. This study explored the psychological impact of excessive internet use and attentional regulation within a diverse Indian population.

Internet Gaming Disorder (IGD) is recognized as a condition for further study in DSM-5-TR and officially classified in ICD-11. Although gaming problems seem like an adolescent concern, growing evidence indicates that young adults are also vulnerable. This systematic review and meta-analysis aimed to estimate the global prevalence of IGD among young adults and identify sociodemographic and methodological moderators associated with its variability. Ninety-six analytical samples from 93 studies published (2015-2025) were included, comprising 149,601 participants aged 18-35 (M = 23.53 years, SD = 6.28; 51.22 % female). Generalized linear mixed models were applied to compute pooled prevalence estimates. The pooled prevalence of IGD was 6.1 % (95 % CI: 5.03-7.40). Prevalence was significantly higher in gamer-only samples (8.1 %, 95 % CI: 5.91-11.01) compared to mixed samples, including gamers and non-gamers (5.47 %, 95 % CI: 4.33-6.90). Moderator analyses showed that IGD prevalence differed by diagnostic instrument (IGDS and DSM-V criteria > IGDT-10) and by sample size, and a trend also emerged suggesting lower prevalence with higher proportions of women. In gamer-only samples, prevalence increased over time and in studies with a higher risk of bias. In mixed samples, prevalence differed by instrument (IGDS > GAS) and was negatively associated with sample size. These findings indicate that IGD is more prevalent among young adults than in the general population, especially among gamers. The variability observed across studies highlights the need for methodological consistency and the use of validated diagnostic tools to improve comparability and inform prevention and intervention strategies.

Considering the pervasive integration of smartphones into the daily lives and high prevalence of problematic smartphone phone use (PSU) among emerging adults, there is an urgency for an integrated perspective to understand their PSU for better intervention insights. This study aims to apply a multi-level theoretical framework, the Differential Susceptibility to Media Effects Model (DSMM), to PSU and evaluate not only the direct effects of dispositional (i.e., neuroticism), social (i.e., family adaptability), and developmental factors (i.e., inclusion of smartphone in the self [ISS]) on PSU but also the potential indirect effect of ISS. We obtained a sample of 801 Chinese emerging adults (559 females; M = 19.02 and SD = 0.88) through a one-year longitudinal study with two surveys (at wave 1 [W1] and wave 2 [W2]). Hierarchical regression analysis indicated that all baseline susceptibility factors (neuroticism [W1], family adaptability [W1], and ISS [W1]) significantly predicted PSU (W2) after controlling for both demographics and PSU (W2). The results of structural equation modeling further suggested that neuroticism (W1) and family adaptability (W1) were longitudinally associated with ISS (W2), which was in turn associated with PSU (W2). This study provided not only longitudinal evidence to support the application of DSMM to explain PSU but also insights into interventions using targeted approaches.

Cannabis has shown mixed results in its association with alcohol urge, which may be explained by individual differences. One such factor, working memory capacity (WMC) is associated with drug-related cue reactivity and implicated in alcohol use and problems. In the current study, we examined whether WMC moderates the acute effect of cannabis on alcohol urge in a randomized placebo-controlled crossover trial.

General executive functions and decreased stimulus-specific inhibitory control may be relevant factors for the development and maintenance of problematic social network use (PSNU). Related predisposing variables that are risk factors for PSNU may include self-directedness, ADHD symptoms, or impulsivity, and as a result, social networks (SN) may be habitually utilized, which can manifest over time. Theoretical models suggest that interactions between predisposing factors and PSNU may influence neurocognitive deficits during problematic behavior. Therefore, we investigate possible interaction effects of SN use type (PSNU vs. non-problematic use) and predisposing factors on the expression of cognitive control mechanisms.

This study investigates whether parenting styles can buffer the intergenerational transmission of substance use. Using a person-centered analytic strategy with 4,280 adolescent-parent dyads in Brazil, we applied Latent Class Analysis to identify substance use profiles in both generations and modeled their association using Latent Transition Analysis. Parental and adolescent profiles were strongly aligned, especially among abstainers. However, this similarity was not deterministic: authoritative parenting significantly reduced adolescents' likelihood of polysubstance use - even among high-risk parents. Authoritarian parenting also reduced this risk but increased alcohol-specific transmission. Permissive and neglectful styles showed no protective effects. These findings underscore the role of parenting style and highlight the value of family-based interventions to disrupt intergenerational substance use patterns.

As recreational cannabis increases among United States adults, there is growing interest in understanding potential health co-morbidities. Although past work supports cannabis use and eating disorder comorbidity, and cannabis enhances appetite and reward responses to food, little is known about how specific cannabis use patterns may relate to binge eating and other eating disorder symptoms. The purpose of this study is to identify distinct subgroups of recreational cannabis users based on several use characteristics, including subjective changes to appetite and hedonic properties of food using latent profile analysis, and to examine differences across profiles in binge eating, other eating disorder symptoms, and emotion regulation. Participants (N = 435, male = 189) were adults recruited through Prolific who endorsed past-month cannabis use and completed a battery of self-report measures assessing cannabis use characteristics, eating changes while using cannabis, eating disorder symptoms, and emotion regulation. Results identified four profiles: "Infrequent Users, Moderate Eating Changes, Low Risk," "Intense Users, Low Eating Changes, Mild Risk," "High-Risk Coping Users, Strong Eating Changes," and "Frequent Users, Slight Eating Changes, Mild Risk." All profiles reported more binge eating symptoms while under the influence of cannabis; the "High Risk Coping Users, Strong Eating Changes" profile reported the most severe sober binge eating, eating disorder, and emotion regulation difficulties. Findings highlight the utility of person-centered approaches for capturing co-morbidity risk and may help guide screening and intervention tools for determining eating disorder risk among those using cannabis.