ASHRAE: "Can Displacement Ventilation Control Secondhand ETS?"
Eurekalert: "High-tech ventilation fails to control secondhand smoke"
consumeraffairs.com: "Ventilation Systems Don't Make Smoke-Filled Bars Safer - Secondhand Smoke Nearly Doubles Breast Cancer Risk"
Enquirer: "Smoke filters found less effective than bans"
MSNBC: "Ventilation systems can make cigarette smoke worse"
Report of the Surgeon General (June 2006): "The Health Consequences of Involuntary Exposure to Tobacco Smoke"