E-cigarettes are widely used among young adults, with propylene glycol (PG) as a common component. While PG has been associated with potential respiratory risks, its impact on lung function—particularly the FEV1/FVC ratio—remains unclear in young male populations. This study also examines the Islamic perspective on e-cigarette use, considering health preservation (hifz al-nafs) and harm avoidance (darar). To investigate the relationship between e-cigarette use and PG exposure on lung function, and to analyze the findings from an Islamic ethical standpoint, a cross-sectional study was conducted with 40 male e-cigarette users aged 17–25. Data were collected through spirometry to measure FEV1/FVC ratios, along with structured interviews on e-cigarette use habits, respiratory symptoms, and demographic variables. Statistical analysis was performed to assess correlations. All participants had normal FEV1/FVC ratios (>75%), with no significant association found between e-cigarette use, duration, or PG exposure and impaired lung function. However, 47.5% reported subjective respiratory symptoms, and 7.5% noted libido changes. BMI varied widely, with 72.5% of respondents classified as overweight or obese. E-cigarette use in young males was not associated with measurable declines in lung function based on FEV1/FVC ratios, despite reported respiratory complaints. Long-term effects remain uncertain. From an Islamic perspective, e-cigarette use is debated; most scholars consider it makruh (discouraged) due to potential harm and wasteful expenditure, though explicit religious rulings remain contextual
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