Abstract: Introduction: Use of tobacco significantly harms public health and increases the probability of a variation of human diseases & conditions, together with respiratory problems, cardiovascular disease & mouth cancer. There is a lot of research proving that smoking cigarettes and periodontal disease go hand in hand. Severe periodontitis is five times as likely to affect smokers as non-smokers.2 Smoking is a risk cause of periodontal disease on its own, smoking increases the risk of periodontal disease. Which found an overall odds ratio of 2.82 with 95% assurance intervals between 2.36 and 3.39. According to epidemiological studies, smokers have more tooth loss. According to study, nicotine-related changes to specific adolescent brain regions may cause smoking to continue into adulthood. These alterations also have what is frequently described to as a "gateway" effect, which raises the prevalence of other substance use disorders in adolescent smokers.6. The present study title: “An exploratory study to assess the knowledge regarding ill effects of cigarette smoking and it's prevention among adolescent boys and girls in selected schools of Pune city”. Objectives of the study: 1. To determine how well-informed adolescent boys & girls are about the negative effects of smoking and how to prevent them.2. To associate the findings with selected demographic variables. Material and Methods: Researcher adopted descriptive research design. The study carried out on 300 samples. Non - probability purposive sampling method was used to collect data using demographic profile and clinical profile. Data analysis was done using descriptive statistics. Results: The finding shows majority 54% have average knowledge, 32 % have poor knowledge 14% have good knowledge towards ill effects of smoking and its prevention. Conclusion: Previous knowledge is associated with p value <0.05. and, Age, education, gender and place of residence are not associated with p value >0.05.

Assess, knowledge, smoking, prevention, adolescent