 EMA refers to using electronic handheld data collection devices to collect real-time information about stress, drug cravings and drug use participants in the context of their daily routine, rather than in a research study. In this study, participants will be given a smartphone to carry for up to one year. The current phone model used is the Motorola Droid X2, running applications developed using a software platform created by the Center for Clinical Global Health Education CCGHE at the Johns Hopkins School of Medicine. The application, named the electronic Mobile Open-source Comprehensive Health Application eMOCHA, has been used to support community health workers in resource poor areas heavily impacted by HIV. It has been modified by the CCGHE programming team specifically for this study. A staff member will train participants in how to use the eMOCHA interface and all relevant features of the smartphone. Participants will be required to show they can run a demo questionnaire before commencing use in the field. 