Background of the study: Tobacco users have become more common and it is a leading cause of incurable disease. More than 5 million people are dying. The annual death will rise to 8 million by 2030. The fourth round of Global Youth Tobacco Survey revealed prevalence of tobacco use among boys was 9.6%. Many of the studies suggested education through media will help the adolescents to be aware of using tobacco products and its ill effects. Objectives: The objective of the study was to evaluate the effectiveness of audio visual display on knowledge regarding ill effects of tobacco products among adolescent boys and to find out an association between pretest knowledge scores with their selected socio demographic variables. Methodology: An evaluative study was conducted among 30 Adolescent boys (16 to 19 years) studying in P.C Jabin's PU College of Science, Hubballi. The research design used for the study was Pre-experimental; one group pre-test, post-test design. Samples were selected by using Simple random sampling technique. Structured knowledge questionnaire was used for obtaining the level of knowledge. Results:The study results revealed that, majority of the subjects in pre-test 16 (53.3%) had average knowledge, 10 (33.4%) had good knowledge and 4 (13.3%) had poor knowledge. Whereas, in post-test after Audio-Visual Display, 24 (80%) had good knowledge and 6 (20%) had average knowledge regarding ill effects of tobacco products. There was a significant gain in their knowledge i.e 47.37% of after administration of Audio Visual Display. With regard to statistical association, there was an association between subject's family history of any habits of tobacco products and pretest knowledge scores. Conclusion:The study concludes that intervention using Audio Visual Display regarding ill effects of tobacco products was effective in enhancing the knowledge of adolescent boys.

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