Teen age is the age where child starts to grow in the way they think. This can be positive or negative. Teenage is vulnerable population to initiate tobacco use. Study was to assess effectiveness of planned teaching regarding hazards of nicotine dependence on knowledge among teenagers. Pre-experimental one group pre-test, post-test design was used for study. 100 sample were selected by probability simple random sampling technique. Result of study at pre-test 12% teenager had poor knowledge, 69% had average knowledge and 19 % had good knowledge. After post-test 2% teenager had poor knowledge, 10% had average, 88% had good knowledge. Pre-test knowledge mean score was 11.09 and post-test knowledge mean score was 16.51.Comparison value of t is 16.32 which is greater than tabulated t value 1.9840 (p < 0.05). This shows that there is significant difference in knowledge score at pre-test and post-test. There was no any significant relationship between knowledge and demographic variable. Planned teaching programme was found to be effective.

Keywords: Nicotine dependence; Teenager; Planned teaching; Hazards; Knowledge.