We introduce a novel use of genetic data for studying social influences on behavior: Using data from the National Longitudinal Study of Adolescent to Adult Health (Add Health), we deploy the distribution of genotypes in a given grade within a school to instrument the influence of peer smoking on...

A considerable amount of research has established that the married live longer, healthier lives than the previously- and never-married. Similar research on the health benefits of cohabitation is sparse, and virtually nonexistent from adolescence into young adulthood despite substantial levels of...

We introduce a novel use of genetic data for studying social influences on behavior: Using data from the National Longitudinal Study of Adolescent to Adult Health (Add Health), we deploy the distribution of genotypes in a given grade within a school to instrument the influence of peer smoking on...