| Inclusion Criteria: | 1) Must be enrolled in protocol 2004-0616 "Behavioral, Contextual and Genetic Predictors of Smoking in Mexican-American Youth", CPN00-367 "Mexican-American Cohort: A Feasibility Study of Recruitment Methods for a Long-Term Prospective Cohort Study in Texas", or 2009-0379 "Mexican American Cohort Study". |