<p>Re: cigarette secondhand smoke versus pollution</p>
<p>Here is a study comparing particulate matter pollution from cigarettes versus car exhaust in an enclosed garage:</p>
<p>[Smoking</a> Worse Than Exhaust for Air Pollution](<a href=“http://www.webmd.com/lung/news/20040823/smoking-worse-than-exhaust-for-air-pollution]Smoking”>COPD: Symptoms, Causes, Types, Diagnosis, Treatment)
<a href=“http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1747905/.../v013p00219.pdf[/url]”>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1747905/.../v013p00219.pdf</a>
[Particulate</a> matter from tobacco versus diesel car exhaust: an educational perspective – Invernizzi et al. 13 (3): 219 – Tobacco Control](<a href=“http://tobaccocontrol.bmj.com/content/13/3/219.abstract]Particulate”>Particulate matter from tobacco versus diesel car exhaust: an educational perspective)</p>