As a major killer, diabetes places a significant financial strain on healthcare systems across the globe. This research aims to determine the prevalence of smoking and physical inactivity among diabetics attending Diabetes Clinics in King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia. We used a cross-sectional study design. Data was collected during the clinical appointments at the Diabetes and Endocrinology clinics. All diabetic patients attending the Diabetes and Endocrinology clinics in KFAFH, aged 18 and above. Using the Raosoft calculator, the sample size was 243 diabetic patients. The sampling technique is non-probability convenient sampling. The study included 100 participants. The mean age of study participants was 50.07 + 18.8 years. Age ranged from 16 to 90 years. There were 66 male participants and 34 female participants. Type of diabetes was statistical significance with regular exercise, especially among type 2 diabetes patients (P= 0.041). The use of insulin was statistical significance with blood glucose monitoring (P= 0.004). Male participants were smokers more than female participants (P= 0.003). Patients with current complications were more smokers than others (P= 0.042). Patients with a family history of diabetes were more smokers than others (P=0.016). Participants in this study exhibited some risky behaviors with regard to their diabetes condition. Lack of exercise, smoking, less frequent blood glucose monitoring and not following up with a dietician were the most risky behaviors. This is reflected by the high prevalence of diabetes complications among study participants.