dr. dua's answer
swine flu
regular flu
cancer
and the worst of all MONEY LOSS
EmphysemaLung DiseaseHeart DiseaseVarious Cancers
Lung Disease
cancer leukimia bronchitis enphasima
A few of the many is lung cancer, throat cancer, emphysema, heart attack, strokes, and of course you can die.
This is a very large list. To see it, go here: http://www.peoples-health.com/blood-diseases.htm