Many years of concerted policy effort in Western countries has not prevented young people from experimenting with cigarettes, alcohol and marijuana. One potential explanation is that social interactions make consumption "sticky". We use detailed panel data from the Add Health survey to examine...

Recent studies analyzing the effects of religion on various economic, social, health and political outcomes have been largely associational. Although some attempts have been made to establish causation using instrument variable (IV) or difference-in-difference (DID) methods, the instruments and...