A great deal of the literature delineating the experience of addiction uses cross-sectional survey data or longitudinal data separated by wide gaps of time. Although this research is critical and is useful for answer certain questions, these research designs are unable to answer certain questions, such as about proximal contextual factors associated with within-person differences in substance use, or about psychological processes that shift moment to moment that may increase risk of substance engagement. Dr. Lorraine Collins talks about her seminal work applying ecological momentary assessment methodologies to alcohol and cannabis. Dr. Lorraine Collins is the Associate Dean for Research in the School of Public Health and Health Professions, and a Professor in the Department of Community Health and Health Behavior at the University at Buffalo.