RESUMEN
Cancer is a major health problem worldwide. Several factors are involved in cancer. However the role of environmental factors is more prominent. Modification of these factors into proper behavior would help to prevent cancer. Accordingly this study was done with the aim of evaluating the exposure to carcinogenic agents in Tehran citizens. It was a descriptive, cross- sectional survey. The sample consisted of 2500 Tehran citizens who were recruited by systematic cluster random sampling. Data was collected by a researcher- made instrument with five parts including demographic information, and questions regarding alcohol and tobacco use, radiation exposure, exposure to chemical agents, and reaction to stress. Data was analyzed by descriptive statistics using SPSS-PC [v. 11.5]. The result showed that10% of the sample had consumed alcohol, 16% were Smokers. 22% were encountered U.V, 88/4% had not contact with chemical agents at work place. 94/4% were not taking oral contraceptives. The majority of Tehran citizens [45/8%] got angry sometimes. Most of Tehran Citizens exposed to carcinogenic agents, especially radiation, cigarette smoke, chemicals and with less intensity with stressors. Due to alcohol being forbidden in Islam, no clear information is available about its consumption. To educate people about the carcinogenic agents can be helpful