CFC's are fatal for ozone. They react with them to deplete them.

CFC's may cause ozone depletion by reacting with ozone. They react and decompose them to form other chlorine and fluorine compounds thus depleting the ozone layer.

CFC's are naturally occurring. Some people disagree and say they are completely man made.

CFC's are catalysts. They fasten the rate of reaction.

Because it is more dense than the air we breathe so it sits in your lungs and doesn't allow atmospheric air in. If you were to turn upside down, this should allow the CFC to escape your lungs allowing you to breathe again.