Key Takeaways Smoking is strongly associated with an increased risk of multiple vision-threatening eye diseases, including cataracts, glaucoma, macular degeneration, and retinal vascular conditions The study, based on a large global dataset, found that smokers consistently had significantly higher risks across all conditions analyzed compared to non-smokers These findings highlight smoking as a modifiable risk factor for vision loss and underscore the importance of incorporating smoking cessation into eye care and public health strategies. A new global study has found that smoking significantly increases the risk of several vision-threatening eye conditions, reinforcing calls for stronger public health messaging around the dangers of tobacco use.1 The peer-reviewed study published in Clinical Ophthalmology analyzed health data from more than 12 million patients worldwide, making it one of the largest investigations to date into smoking and eye health. Researchers used a global electronic health records database to compare outcomes between smokers and non-smokers over a 10-year period. After matching patients for demographics and health factors, the study found that smokers consistently faced higher risks across all major eye diseases examined. Among the most striking findings: Cataracts: Smokers were more than 2.6 times as likely to develop certain forms Uveitis (eye inflammation): Risk increased by over 2.4 times Retinal vascular occlusions: Risks were more than doubled, raising the chance of sudden vision loss Glaucoma: Risk rose by 1.5 to 2.4 times, depending on subtype Age-related macular degeneration (AMD): Risk increased by about 85% Diabetic retinopathy: Risk was modestly higher but still significant Overall, the results showed a statistically significant increase in every vision-threatening condition studied (P<0.0001). Scientists point to multiple biological mechanisms behind the increased risk. Tobacco smoke contains thousands of toxic chemicals that trigger oxidative stress and inflammation in eye tissues; damage blood vessels, reducing oxygen supply to the retina; and harm mitochondrial DNA in retinal cells, accelerating degeneration. These processes can contribute to both chronic eye diseases and acute events like retinal artery occlusion. Vision loss linked to smoking is already a global issue. Previous research shows smoking contributes significantly to blindness from conditions like cataracts and AMD, with the burden expected to persist as populations age. Despite this, the study notes that many eye care providers do not routinely assess smoking status or offer cessation support, representing a missed opportunity for prevention. The authors urge ophthalmologists and public health professionals to: Incorporate smoking history into routine eye risk assessments Use vision loss risk as a motivational tool for smoking cessation Increase awareness that smoking threatens not just lungs and heart—but also sight Reference 1. Gad El Sayed M, Vu Pham N, Bandaru D, et al. Smoking and Risk of Vision Threatening Complications: A Global Database Analysis. Clin Ophthalmol. 2026;20:596936. https://doi.org/10.2147/OPTH.S596936