But a drop in oxygen levels can cause a health emergency in people with heart or lung problems.

VOA: special.2009.07.14

They also say persons with heart or lung problems should seek advice from their doctor before flying.

VOA: special.2009.07.14

C.D.C. official Janet Collins says breathing secondhand smoke has immediate harmful effects on a person's heart-and-lung system.

VOA: special.2009.01.07

Nonsmokers are also affected. Thousands in the United States die each year from heart disease and lung cancer from breathing other people's tobacco smoke.

VOA: special.2009.05.27

GINA is a joint effort between the National Heart, Lung and Blood Institute of the National Institutes of Health and the World Health Organization.

VOA: special.2009.07.28

GINA is a joint effort of the World Health Organization and the National Heart, Lung and Blood Institute of America's National Institutes of Health.

VOA: special.2010.09.07

The World Health Organization says at least five million tobacco users die every year from lung cancer, heart disease and other smoking-related causes.

VOA: standard.2010.02.18

WHO says declining air quality worsens illnesses and deaths from asthma,heart disease, and lung cancer.

VOA: standard.2009.03.23

Doctors warn patients with lung and heart disease to stay indoors during hot weather.

VOA: standard.2010.08.04

"Just imagine,a severe pandemic coming at such a fragile time in a world where there are many people suffering from chronic diseases like heart disease, lung disease,including asthma, cancers,with many more people suffering from HIV, obesity and the list goes on,".

VOA: standard.2009.12.29