Smoking, including cigarette, cigar, and pipe smoking, is thought to be responsible for 80% of all lung cancer diagnoses. And while heavy smokers are at the highest risk, any amount of smoking is the wrong amount. Learn more about how you can quit with these resources.

Smoke and secondhand smoke: Cigarette smoke contains more than 7,000 chemicals and can harm nearly every organ in your body. It affects not just the person smoking, but those who breathe secondhand smoke and even unborn babies.

Major sources of pollution are all around us, from power plants to manufacturing facilities to the vehicles we drive.

Climate change: The buildup of greenhouse gases is creating warmer temperatures, which increase the risk of unhealthful ozone and particle pollution levels. Climate change also leads to other health threats from heat waves, drought, flooding, more intense hurricanes and the spread of disease.