An older adult with health problems may suffer the effects of carbon monoxide more quickly than a younger person with no health problems. People with heart disease may suffer chest pains. They may begin to have trouble breathing.

Carbon monoxide does not always cause death. But it can cause many medical problems. Breathing low amounts of the gas for long periods of time can lead to permanent damage in the heart, lungs or brain. Experts say small amounts of carbon monoxide over a long period of time can greatly harm an unborn baby.

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BOB DOUGHTY: What causes carbon monoxide gas? Any device that burns fuels like coal, gasoline, kerosene, oil or wood can create the gas. Water heaters that burn natural gas create carbon monoxide. Fireplaces and stoves that burn wood create the gas. Natural gas stoves and gas dryers or charcoal grills also create carbon monoxide. Automobiles create it.

Experts say the leading cause of carbon monoxide poisoning is damaged or misused equipment that burns these fossil fuels. Many people die or are injured by the gas because they do not use these devices correctly. Any device used to heat a home should be inspected to make sure it is working correctly. And, cooking equipment like a charcoal grill should never be used to heat an enclosed area.

SHIRLEY GRIFFITH: Fuel-burning devices can create carbon monoxide gas because not all of the fuel is burned. Most devices used for home heating have a way to expel the gas from the home. For example, a fireplace has a chimney. Natural-gas stoves or gas water heaters are usually connected to a device that safely expels the gas from the home. Automobiles also have a system for releasing unburned fuel.