Smoke from a fire can have a dangerous impact on your physical and mental health, even from thousands of miles away.
When it comes to the long-term effects of smoke exposure, "we're all research subjects," one public health expert said.
The death toll from the fires in California, Oregon and Washington stood at 31 and was expected to rise sharply.
The air quality in Seattle and other parts of Washington, classified as "unhealthy," is finally beginning to improve.
The California wildfires are the deadliest in the state’s history. But the smoke is contributing to a longer-term and public health crisis.
Worldwide air pollution caused 5.5 million deaths in 2013 from lung cancer stroke, bronchitis and other diseases -- more than malaria or AIDS.
Both kinds of smokers are at high risk of gum disease.
Sleep can actually affect cholesterol -- and poor sleepers are far more likely to smoke.