How many people smoke cigarettes per square mile?

17.4 smokers per square mile

The total land area on Earth is

about 57.5 million square miles. There are approximately one

billion smokers worldwide. By dividing the number of smokers

worldwide by total land area, one would find that on average, there

are about 17.391 smokers per square mile when distributed evenly.

Of course in the real world, humans are not equally spread across

the planet, meaning that there are areas that have more smokers

than this and others that have less. This figure is therefore

merely a mean estimate.

Sources

http://www.who.int/mediacentre/factsheets/fs339/en/

http://www.universetoday.com/25756/surface-area-of-the-earth/