Re: Does the gas emitted from napthalene interfere with human gas exchange?

Napthalene, in the strict sense, can cause a destruction of erythrocytes 
(red blood cells) upon inhalation which can lead to a condition called 
anemia.  As you may know, erythrocytes perform the essential function of 
transporting O2 from the lung to the rest of the body.  When the amount of 
erythrocytes destroyed exceeds the number of erythrocytes being produced, 
O2 transport may be compromised.  One of the first organs to show signs of 
anemia is the central nervous system (it's one of the most sensitve organs 
to this type of toxicity).  

Considering this, you need to keep in mind that the dose makes the poison. 
The amount of napthalene emitted from moth balls is quite low - it's 
highly unlikely that one would experience anemia from sniffing moth balls.