Background: It has been shown that smoking habits characterize an increased risk for impaired Osseo integration or bone healing and finally implant failure. Purpose: The aim of this retrospective clinical study was to investigate the impact of cigarette smoking and nonsmoking on the bone healing around locking-taper dental implants. Materials and Methods: A retrospective analysis was made over a 4 years and 9 months period of the clinical and radiographic findings corresponding to 54 consecutive patients (34 women and 20 men) who had received a total of 162 implants. Patients were divided into two groups: Smokers, 20 patients (received 72 implants); and nonsmokers (NS), 34 patients (received 90 implants). Smokers were identified as people smoking >15 cigarettes per day. The success and failure cases were evaluated and studied. The data were analyzed using descriptive statistics.Results: Four implants out of 162 implants (2.46%) failed and had to be removed.Conclusions: Within the limitations of this study, the results indicated a high success rate 97.5% (158/162). No real difference in proportion of failure of implant placement both smokers and NS (P = 0.8577). KEY WORDS: Implant, nonsmoking, Osseo integration, smoking.