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Problem-drinking among university students is common and poses serious health-related risks. Therefore, identifying and addressing associated factors is important. A large cross-sectional online-survey with 12,914 university students from Berlin was conducted from November 2016 to August 2017. Relative-risk- and correlation-analysis was used to identify factors associated with problem-drinking and regular heavy-drinking. Independent t-tests compared impulsivity and personality traits, chi-square-tests compared drinking motives between risk- and non-risk-drinkers. Male gender, tobacco-smoking, illegal substance use, impulsivity and various sociodemographic and psychosocial variables were significantly related to problem/heavy-drinking. Extraversion was a risk, conscientiousness and agreeableness were protective factors. Drinking-motives did not differ significantly between risk- and non-risk-drinkers. Generally, the main drinking-motives were to feel elated, relax and social purposes. The identified markers and related problem behaviors may serve as a tool to enhance the identification of student subgroups at risk for problem/heavy-drinking, and hence improve targeted health-intervention-programs. [ABSTRACT FROM AUTHOR]

Background: As a big European city famous for its party scene, Berlin attracts college students that are a high-risk population for cannabis use and use disorder. College years are often associated with new behavior patterns, but the factors leading to cannabis initiation are rarely studied past adolescence. This study describes the longitudinal evolution of college students' cannabis use over two years and its correlates. Method: Data was collected among all students of Berlin's public colleges via two online surveys (N = 1,201, mean interval = 16 months). Multivariable binary logistic regressions were performed on four outcomes: regular use, use initiation, use reduction and use cessation. Several dimensions of covariates were used: socio-demographic factors, psychological (locus of control, impulsivity, psychiatric diagnosis), behavioral (other substance use), perceived harm, declared intention to reduce and setting of cannabis use. Results: Overall, the majority of respondents did not change their cannabis use. The factors for use initiation (impulsivity, tobacco and alcohol use) were not fully symmetric to the factors leading to cutting down/quitting (locus of control, perceived harm, tobacco use). Perceived harm had an impact on quitting, but not on reducing use. The intention to reduce did not significantly predict subsequent use behavior. Most regular users use cannabis at home, which was associated with a low probability to reduce. Conclusions: No simple symmetry exists between correlates of initiation and cessation: tobacco co-use is important for both, while impulsivity and alcohol use lead to initiation and internal locus of control facilitates cessation. [ABSTRACT FROM AUTHOR]

Research suggests that university students are at high risk of using licit and illicit substances and that there has been an increase over the last decade in substance use among university students in Berlin, Germany. The present study aims to investigate the relationship between personality and substance use among university students in the city of Berlin. A sample of 8778 students from 17 Berlin universities completed an online questionnaire. Short versions of the Big Five Inventory and the Barratt Impulsivity Scale as well as the SOEP-scale (German socioeconomic panel) for the concept of locus of control were used to assess personality traits. Four different user groups and six specific substances were studied using multinomial logistic and logistic regression models. Participants regularly using substances scored higher on impulsivity and openness and lower on conscientiousness compared to the other user groups. Further, they scored higher on extraversion and external locus of control compared to participants not using substances or exclusively drinking alcohol. Out of the personality dimensions examined, the relationship between substance use and impulsivity was strongest and had the highest effect size (medium) in our sample. Despite increasing prevalence among the high-risk group of university students in Berlin, universities have not yet sufficiently adopted prevention programs. These programs should be adapted to meet the needs of the target group which may be complemented with the findings of the study (e.g. emotional regulation training and goal management training). [ABSTRACT FROM AUTHOR]