Yahoo! News - Smoking Speeds Up Memory Loss in Old Age
NEW YORK (Reuters Health) - Elderly people who smoke show a five-fold faster rate of age-related mental decline than people who never smoked, according to new study findings released Monday.

Among former smokers, mental decline occurred around twice as fast as in those who said they never smoked.

And the more people smoked during their lifetimes, the quicker they appear to lose their mental faculties with age, the authors note.

Aha! I think I've just discovered what's wrong with my Dad...