The Claim
Smoking more than 40 pack-years is associated with a 2.75-fold increased odds of developing end-stage age-related macular degeneration, including geographic atrophy and choroidal neovascularisation, compared to non-smokers.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
People who have smoked more than 40 pack-years have 2.75 times higher odds of developing advanced age-related macular degeneration, including geographic atrophy and choroidal neovascularisation, compared to people who have never smoked.
See the scientific wording
Smoking more than 40 pack-years is associated with a 2.75-fold increased odds of developing end-stage age-related macular degeneration (AMD), including both geographic atrophy and choroidal neovascularisation, compared to non-smokers, indicating that cumulative cigarette exposure is a major risk factor for vision-threatening retinal disease.
Cigarette smoke introduces toxic chemicals into the blood, which damage the layer of cells behind the retina. This damage causes waste to build up, weakens a supporting membrane, and triggers abnormal blood vessels to grow into the retina. At the same time, the body's natural cleanup system becomes less effective, letting inflammation run unchecked and killing retinal cells. Together, these processes destroy vision.
What the research says
1 studyPeople who smoked the equivalent of one pack a day for 40+ years were nearly three times more likely to develop severe vision loss from AMD than non-smokers, according to this study. Quitting for over 20 years lowered the risk back to normal.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.