SimSmoke

The World Health Organization (WHO) have released their report Policy recommendations on protection from exposure to second-hand tobacco smoke. This document offers approaches to implementing policies that protect people from exposure to secondhand smoke. From the executive summary:

Scientific evidence has firmly established that there is no safe level of exposure to secondhand tobacco smoke (SHS), a pollutant that causes serious illnesses in adults and children. There is also indisputable evidence that implementing 100% smoke-free environments is the only effective way to protect the population from the harmful effects of exposure to SHS.