Background: In April 2009, there were reports of sustained human-to-human infections with a new influenza A (H1N1) virus in

- Abstract: Lung cancer is a major health problem worldwide. The incidence is increasing globally at a rate of 0.5% per year. It is the leading cause of cancer mortality in most of the countries in the world. It is well known that lung cancer rates are high in developed countries; nevertheless, the developing countries do not la behind and the rates are getting closer to the rates that are seen in developed countries. Aim: The aim of the study was to assess the effectiveness of structured teaching programme regarding knowledge on prevention of lung cancer among male adolescents in selected colleges of Guntur district, Andhra Pradesh” Objectives: 1. To assess the knowledge regarding prevention of lung cancer among male adolescents by administering pre-test. 2. To prepare and administer the structured teaching programme regarding prevention of lung cancer to male adolescents. 3. To analyze the effectiveness of structured teaching programme regarding prevention of lung cancer among male adolescents by administering post-test. Methodology: A pre experimental research Design was adopted. 80 Male Adolescent Students were selected by simple random sampling technique. Results: In Pre-Test mean score was 9.67 with standard deviation of 2.48 and In Post-Test mean score was 18.67 with standard deviation of 2.92. The obtained calculated‘t’ value was 8.633, which is greater than the table value of 1.65. It shows that there was a significant difference between pretest and posttest knowledge regarding prevention of lung cancer among male adolescents. Hence structured teaching programme was very effective. Conclusion: This study concluded that in the pre-test knowledge was less and after structured teaching programme, in post-test overall knowledge was improved regarding prevention of lung cancer as it was shown by their attained scores.