Blood I think
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Since smokers are not allowed to smoke within restaurants, office buildings, airports, schools, and many other places, far fewer people are being exposed to secondhand smoke. People with asthma and allergies to cigarette smoke are now able to breathe more easily as well. Children are no longer being exposed to secondhand smoke in spaces outside of their homes.
Answer: Exotic disease
Explanation: Exotic disease is a term used to describe infectious disease which are currently absent in a particular country but present in some other countries in the world. An exotic disease could result either due to the fact that such disease has never surfaced in the country or it has been completely eradicated through through quarantine or any other eradication scheme.
For Instance, pseudorabies is an exotic disease in Denmark because it has been eradicated in the country, while it isn't in Ireland.