Stub it out, please

Second-hand smoke can double the risk of macular degeneration, said a British study. While it is common knowledge that smoking is bad for sufferers of MD, this research has showed passive smoking to be just as dangerous.

Researchers base their findings on 435 people with end-stage MD and 280 partners who lived with them. Non-smokers who lived with smokers for at least five years see their risk doubling.