Aim: to determine the knowledge and attitude regarding tobacco and its use among adolescents students. Material and methods: A prospective, observational study was conducted by the Department of Dentistry, Narayan Medical College and Hospital, Sasaram, Bihar, India, among 13 to 15 years adolescent’s students (studying in 8th and 9th grades). Total 200 students were included in this study. A pre-structured and pretested questionnaire containing the following information was used to collect the data. Data on age, gender, grade, parent’s education and occupation, current use of tobacco products among students, knowledge, attitude and perceptions regarding use of tobacco and tobacco products was obtained using a semi-structured questionnaire. Results: Total of 200 students participated in the study with a mean age of 14.84 ± 4.2 years. Knowledge regarding tobacco content in various products differed with the product. Presence of tobacco in cigarette, gutka and bidi was known to 85.5%, 88.5% and 75% of the students respectively. The students lacked knowledge regarding snuff and khaini being tobacco products (23.5% and 30% respectively). History of use of tobacco in family member was seen in 15%. About 10% students had friends who consumed tobacco products. About 4% of the students thought that tobacco is not harmful.Correct knowledge regarding hazards of passive smoking was present among 87% of the students and 65% students were aware of a law against smoking in public places. Government rules to keep a check on tobacco sale was reported by 55.5% of the students and 58.5% knew that danger signs of using tobacco product are printed on the package of the product. Conclusion: The study suggests though the knowledge of students toward tobacco consumption is adequate, tobacco consumption habit is higher in students. This gap can be reduced by proper counseling of the students.