There are a variety of data sources used in studies that explore the role of religiosity in substance use. A review of the literature suggests that there are a number of studies using either primary data collected from local communities or data from nationally representative samples. One of the potential challenges in using a survey designed to obtain data from a nationally representative sample is that it may have a limited number of religiosity and substance use variables. Examples of national data sets with measures of both include the National Youth Survey, the National Survey on Drug Use and Health, Monitoring the Future Survey, National Longitudinal Survey of Adolescent Health, and the National Survey of Children. Many of the methodological problems that exist in research exploring the relationship between religiosity and behavioral outcomes are detailed in Section 1.