Results: Revealed that students in IG had signifi cantly higher knowledge scores than those in NIG during follow-up visits (24.29+7.97 vs 23.58+8.44 on the fi rst visit), (29.10+8.52 vs 24.09+8.69 on the second visit) (26.59+8.26 vs 22.08+8.04 on the third visit) and (25.54+8.34 vs 21.26+9.60 on the fourth visit). Attitude scores were not signifi cantly different in both groups. Quit rate at four months after intervention was signifi cantly higher in IG as compared to the NIG (45%; 71/158 vs 32%; 60/188) (P=0.013).