Aim: The prevalence of smoking is relatively high among adolescents. The association of cigaret smoking by high school students with poor academic performance has been investigated in different studies. Our study conduct on the internship students of dental school (Al Farabi colleges for dentistry/Jeddah)) to assess the relationship among the smoking status considered strong predictor(s) on academic achievement. Materials and Methods: 275 students were filled the response of the questionnaire out of which 140 were females and 135 were males. The questionnaire distributed was divided into multiple sections to assess gender, smoking, type and the period of smoking,family situation ( married ), final accumulative grade before graduation, and opinion of the student if there is any influence between the smoking and academic performance. Results: Smoking was more frequent among male than female but the influence of smoking factor among students who had low academic achievement was insignificance. Our results suggest that low academic achievers may be more vulnerable to smoking but it is not the dominant factor affecting academic achievements. Keywords: Performance, Smoking, Achievement, Dental student.