This observational case-control study will investigate the impact of smoking addiction on lower extremity speed and coordination in young adults. Participants aged 18-25 will be divided into two groups based on their smoking status. The study will compare motor coordination and sprint performance between smokers and non-smokers using objective physical tests under standardized laboratory conditions.

This non-randomized controlled study will aim to evaluate the effects of smoking addiction on the speed and coordination of lower extremity movements among healthy young adults. Smoking is known to have detrimental effects on vascular, musculoskeletal, and neurological systems, yet its impact on motor performance-particularly in the lower limbs-has not been sufficiently studied.

Participants aged 18-25 will be categorized into smoker and non-smoker groups based on DSM-IV-TR nicotine dependence criteria and the Fagerström Test. The Lower Extremity Motor Coordination Test (LEMOCOT) will be used to assess motor coordination, while a 30-meter sprint test will evaluate movement speed. Additionally, body mass index (BMI) and bimalleolar diameter and circumference will be recorded to control for confounding physical variables.

All assessments will be conducted in a controlled laboratory environment. The results will be analyzed to determine whether smoking addiction is associated with impaired lower limb motor function. The findings may provide new insights into the functional consequences of smoking in young adults and contribute to the design of preventive and rehabilitative strategies.

Inclusion Criteria:

• Smoking ≥1 cigarette daily for at least 12 months
• Age between 18-25
• Literate and cooperative
• BMI: 18.5-29.9 kg/m²

Exclusion Criteria:

• Orthopedic, neurological, or neuromuscular conditions impairing walking
• Chronic pulmonary or cardiac disease
• Cognitive impairment
• BMI ≥30 kg/m²

Healthy young adults aged 18-25 who are either current smokers (according to DSM-IV-TR criteria) or non-smokers. Participants must be physically active enough to perform sprint and coordination tasks, with BMI within a defined range (18.5-29.9 kg/m²). Participants are recruited from a university setting using both institutional announcements and snowball sampling.