Editing Chain smoking (section)

==Ventilation==
Heating, ventilating, and air conditioning ([[HVAC]]) professionals claim that an airflow of about 30 cubic meters per minute per smoker is required to maintain satisfactory air quality when the smokers are chain smoking.<ref>{{cite book |last=Rock |first=Brian A. |title=Ventilation for Environmental Tobacco Smoke |url= https://books.google.com/books?id=PDupTtFRClkC |date= 13 January 2006 |publisher= Elsevier Science |isbn=978-0-08-052539-6|page=48 }}</ref> However, research confirms that current HVAC systems, while important for general air quality, cannot control exposure to [[Passive smoking|secondhand smoke]].<ref>{{cite book |url=http://www.surgeongeneral.gov/library/secondhandsmoke/report/fullreport.pdf |page=92 |title=The Health Consequences of Involuntary Exposure to Tobacco Smoke: A Report of the Surgeon General |publisher= [[Surgeon General of the United States|Office of the Surgeon General]], [[US Department of Health and Human Services]]
|year=2006 |url-status=live |archive-url= https://web.archive.org/web/20090205173605/http://www.surgeongeneral.gov/library/secondhandsmoke/report/fullreport.pdf |archive-date=2009-02-05 }}</ref>