Investigating the impact of smoking habits through photoplethysmography analysis.

UNLABELLED: Smoking is widely recognized as a significant risk factor in the progression of arterial stiffness and cardiovascular diseases. Valuable information related to cardiac arrhythmias and heart function can be obtained by analyzing biosignals such as the electrocardiogram (ECG) and the photoplethysmogram (PPG). The PPG signal is a non-invasive optical technique that can be used to evaluate the changes in blood volume, and thus it can be linked to the health of the vascular system.

OBJECTIVE: In this study, the impact of three smoking habits -cigarettes, shisha, and electronic cigarettes (e-cigarettes)- on the features of the PPG signal were investigated.

APPROACH: The PPG signals are measured for 45 healthy smokers before, during, and after the smoking session and then processed to extract the morphological features. Quantitative statistical techniques were used to analyze the PPG features and provide the most significant features in the three smoking habits. The impact of smoking is observed through significant changes in the features of the PPG signal, indicating blood volume instability.

MAIN RESULTS: The results revealed that the three smoking habits influence the characteristics of the PPG signal significantly, which persist even after 15 minutes of smoking. Among them, shisha has the greatest impact on PPG features, particularly on heart rate, systolic time, augmentation index, and peak pulse interval change. In contrast, e-cigarettes have the least effect on PPG features. Interestingly, smoking electronic cigarettes, which many participants use as a substitute for traditional cigarettes when attempting to quit smoking, has nearly a comparable effect to regular smoking.

SIGNIFICANCE: The findings suggest that individuals who smoke shisha are more likely to develop cardiovascular diseases at an earlier age compared to those who have other smoking habits. Understanding the variations in the PPG signal caused by smoking can aid in the early detection of cardiovascular disorders and provide insight into cardiac conditions. This ultimately contributes to the prevention of the development of cardiovascular diseases and the development of a health screening system.