Smokers are up to four times more likely to go blind in old age, according to research.
A study in the British Medical Journal says cigarettes increase the chances of developing age-related macular degeneration.
Cigarette packets already carry severe health warnings about the dangers of smoking.
The researchers, from the University of Manchester, say the risk of going blind should be added to the list.
Age-related macular degeneration (AMD) is the leading cause of adult blindness in the UK, affecting about 500,000 people.
It results in severe and irreversible loss of central vision, especially in people over the age of 60.