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The present study examines whether the association between substance use and two dimensions of religiosity—institutional and personal—changes as individuals transition from adolescence to early adulthood. Using data from the National Longitudinal Study of Adolescent to Adult (Add) Health, logistic regression models with interaction terms were run to test the hypothesis that the association between an individual's religiosity and his or her level of substance use is stronger during early adulthood compared to adolescence. This hypothesis is based on the observation that the shared family environment largely explains the association between religiosity and substance use during adolescence, while individual‐level characteristics largely explain this association during early adulthood. Overall, my findings support the research hypothesis, but only for the association between institutional religiosity and stigmatized types of substance use (smoking and marijuana use). This study highlights the fact that studies exploring the association between religiosity and substance use should consider potential variation between life stages.

AbstractThe present study explores whether genetic factors explain variation in the levels of apostasy — defined as a disengagement from religious belief, identity and/or practice — in a US-based sample during the transition from adolescence to early adulthood. I posit that genetic factors at least partially explain the variance of three measures of apostasy: disengagement from religious institutions, cessation of prayer and religious disaffiliation. I argue that genetic factors associated with risk-taking behaviors, externalizing behaviors and/or correlates of apostasy may all influence the likelihood of becoming an apostate during the transition from adolescence to early adulthood in the USA. Results reveal that genetic factors explain approximately 34% of the variance in cessation of prayer and 75% of the variance in religious disaffiliation. However, genetic factors do not influence disengagement from religious institutions. This study advances our knowledge of the etiology of apostasy and highlights the need to incorporate genetic data into social scientific research.

At a major conference on genetics in 2003, a team of researchers reported that the Maori, the indigenous people of New Zealand, are far more likely than Caucasians to carry a variant of the MAOA gene that has been associated with aggressive behavior. The scientists argued that the difference made sense and reflected the fact that more aggressive individuals survived the migratory journey by which the Maori originally populated Aotearoa, the islands that would later become New Zealand.