How dangerous are the chemicals in your lungs?

Question: How dangerous are the chemicals in your lungs?
- Keywords:
  cardiovascular,
  chemical,
  danger,
  lung
Asked by joshuawrightiisawesome135797531exe23exe to Audra on 9 Mar 2012.
- Audra Benjamin answered on 9 Mar 2012:
  
  The natural chemicals in our lungs are not dangerous in the amounts that are present and necessary for the lungs to work well.

Question: How dangerous are the chemicals in your lungs?