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In Bangladesh, more than one-fifth (20.5 percent) of the total population, that is 30.68 million is adolescents. Most of the adult smokers initiate smoking in their adolescent period. This study aimed to investigate parental influencing factors for the initiation of tobacco smoking in adolescence period among 15-19 years old college students of Dhaka city, Bangladesh. This was an unmatched case-control study. The information was collected from 91 ever-smokers in the case group and 91 never-smokers in the control group. The respondents