Michael D. Newcomb's research while affiliated with University of Southern California and other places

... 7 Research has shown that tobacco use is associated with initiation of and dependence on other substances, including marijuana. [8][9][10] Additional studies have shown associations between marijuana use and increased daily tobacco smoking and nicotine dependence. [11][12][13] The adverse health consequences of tobacco use have been well documented, including various cancers, chronic obstructive pulmonary disease, stroke, and heart disease. ...

... In the present research we measured behavioral and emotional aspects of good self-control and poor regulation. Testing of the hypotheses was based on a structural model including the four self-regulation measures as predictors of mediating variables (academic competence, negative life events, and deviant peer affiliations) which were related to level of adolescent substance use; in turn, level was specified as a predictor of substance-related behavior problems and impaired-control problems (Stacy & Newcomb, 1999 ). While the crosssectional data do not resolve issues about temporal direction of effects, this analysis tests a model that can be falsified, for example if the self-regulation variables are not related in the predicted manner to the mediators. ...

... The State Apparatuses are less reliable and professional as well as lacking in moral responsibilities who tend to abuse the authority of the position they hold (Jonsen & Toulmin, 1988). Such patterns or attitudes are forms of deviant attitudes that become complex problems (Newcomb & Loeb, 1999), where these human resources have not been able to adapt or accept changes in the surrounding environment which can be said to be less accepting in the face of development of science and technology and difficult to improve the habits comfortable in carrying out their duties, seen with less acceptance of changes that are very fast and dynamic in carrying out their duties, so that the competencies of the apparatus need to be considered (Phillips, 2013). ...

... The lack of communication, in turn, may be due to the fact that Hispanic teen girls are likely to choose partners that are on average three years older. The age difference creates a power dynamic that pushes girls to avoid asking for contraception, in fear of losing the trust of their partner (Goodyear & Newcomb, 2002). Girls in these relationships may also fear abuse and/or retaliation from their partner if trust is compromised. ...

... Rosenberg (1963) emphasizes that the requirement of the sense of being significant to others in developing a sense of self-worth for an individual is crucial. According to Newcomb and Keefe (1997), even though it is emphasized that high self-esteem leads to social support, positive self-esteem may contribute in a supportive network and it may help receive feedback. People, assured of a network of significant others and of their responses, are likely to widen their networks and strengthen their existing relationships. ...

... Dated research that offers limited empirical evidence is a serious concern for organizations, governments, and society, but perhaps just as serious as these concerns are methodological deficiencies within the study of cannabis. Existing research illustrates this point as cannabis is frequently grouped with other substances in a catch-all category despite meaningful pharmacological and physiological differences (Frone, 2008a;Galaif et al., 2001;Harris, 2004;Normand et al., 1990). As evidence of this, one of the most recent studies exploring cannabis use in relation to the workplace published in a premier management journal grouped cannabis and cocaine in a single category (see Galaif et al., 2001). ...

... They tend to show little commitment and a low degree of self-exploration, and have not set any life goals. This profi le is related to early drug initiation and other conduct problems (Newcomb, 1996) and, according to the current study, it is also related to vulnerability to indirect peer victimization. Regarding the self-reliance subscale, we expected to fi nd a signifi cant negative relationship, not a positive relationship. ...

... Earlier literature has established a link between adolescents engaging in non-academic risky behaviors (e.g. delinquency, drug, alcohol, or cigarette use; sexual involvement, and unintended pregnancies) [14][15][16][17], substance abuse [11] and subsequently dropping out of high school [15]. A panel data analysis shows that children whose parents did not participate in Parent-teacher Association (PTA) meetings, discuss academic progress with school teachers, and supervise their children's homework in the first round had a higher risk of dropout in their adolescence (round II) [5]. ...

... Illicit drug use and abuse are important public health problems in the US and can have significant negative effects on physical, psychological, interpersonal, and occupational functioning. 1 Epidemiologic research demonstrates that drug use often begins with experimentation during early adolescence, followed by increases over the course of adolescence, reaching a peak during early adulthood. 2 According to the National Survey of Drug Use and Health, 3 the prevalence rate of past year illicit drug use in 2019 was highest (39.1%) among young adults age 18-25; this was significantly higher than youths age 12-17 (at 17.2%) and adults age 26 or older (at 18.3%). ...

... Developmental psychopathology and systems perspectives suggest that risk factors interact and transact with each other over time in a bidirectional manner (Cicchetti & Rogosch, 2002). Indeed, several longitudinal studies have reported a transactional relationship wherein alcohol use and depressive symptoms exacerbated the other prospectively, providing support for both the impaired-functioning and the self-medication hypotheses (Blume et al., 2000;Gilman & Abraham, 2001;Johnson et al., 2013;Locke & Newcomb, 2001). Therefore, the next logical step to reconcile the inconsistencies in the literature about the associations between depressive symptoms and alcohol use among maltreated adolescents is to examine a third integrative hypothesis that proposes bidirectional associations between alcohol use and depressive symptomology. ...