Radon, a radioactive gas that is found in nearly all soils, has been identified as one of the leading causes of lung cancer in the United States. According to the Environmental Protection Agency, radon causes between 15,000 and 22,000 lung cancer deaths every year in the country.
Many factors cause cancer. From manmade chemicals to environmental exposure, secondhand smoke contributes to health problems that affect the respiratory system, cardiac function and cancers.
Secondhand smoke is the most common cause of tobacco intake. While there are devices that can test for indoor chemicals and smoke, there are nearly no safety measures when encountering smoke outdoors. Because smoke can be anywhere at any time, even breathing in a little bit can be harmful.