This amazing study found that cigarette smoke "may" be dangerous... they must have read the package ;-)
Secondhand Smoke In Cars May Lead To Dangerous Levels Of Contaminants For Children In the first study to measure secondhand smoke (SHS) in cars in real driving conditions, Harvard School of Public Health (HSPH) researchers have shown that smoking in cars can produce unsafe levels of SHS.... http://www.sciencedaily.com