I sure have. I've even seen smoke residue dripping from a ceiling. But, at the same time, we don't know what, if any actual health hazard it actually presents in that sticky tar form, or if the chemicals are in a high enough concentration, even in that form, that occasional contact would have toxic affects to a healthy individual. Again, at what concentration do these chemicals present a health hazard? And do our bodies naturally filter them out at those concentrations? How many of us oldsters played with mercury from a broken thermometer, or came into contact with formaldehyde while dissecting something in biology class without ill affects? Yet these same substances cause a paniced call to a hazmat squad today.
And really, if this smoke is as dangerous 2nd, 3rd or 4th handed as they are saying, why are cigarretes still even on the market? They can remove lead paint and asbestos, but they can't stop the sale of cigarettes? Again, not to say the stale smell of smoke isn't stinky, it is, but stinky doesn't necessarily mean it is a health risk.