The present study is to assess the effectiveness of audio-visual display on knowledgeregarding the use and ill effects of tobacco products among adolescent boys in selected school at Kanpur, Uttar Pradesh. The objectives of the study are to assess the pre-test level of knowledge regarding the use and ill-effect of tobacco products among adolescent boys. To find out the association between pre-test knowledge score regarding the use and ill effect of tobacco products among adolescent boys with their selected demographical variables. To determine the effectiveness of audio-visual display regarding the use and ill effect of tobacco products among adolescent boys. The research design adopted for the study was Quasi Experimental one group pre-test and post test research design were used. The result of thestudy shows in pre-test and post-test level of knowledge, in pre test among the subject 38 sample(63.33%)hadinadequatelevelofknowledge,16sample(26.67%)hadmoderate and 6 sample (10%) had adequate level of knowledge and In post test among the subject 6 sample(10%) had inadequate level of knowledge,10sample(16.67%)hadmoderateand 44 sample (73.33%) had adequate level of knowledge.It was concluded that the findings of this study highlight the value of integrating audio-visual elements into educational strategies for tobacco prevention. The significant gains in knowledge suggest that such multimediatools can be highly effective in conveying important health information to adolescents’ boys, making them a valuable addition to tobacco education programs. By presenting informationin an engaging and interactive format, audio-visual displays can help bridge knowledge gaps and promote healthier behaviors among young people.