The "biohazard" stuff is crap.
Well, third-hand smoke is considered by at least some docs to be a direct cancer risk.
Among the substances in third-hand smoke are hydrogen cyanide, used in chemical weapons; butane, which is used in lighter fluid; toluene, found in paint thinners; arsenic; lead; carbon monoxide; and even polonium-210, the highly radioactive carcinogen that was used to murder former Russian spy Alexander V. Litvinenko in 2006. Eleven of the compounds are highly carcinogenic.
I was playing poker the other night... with Tarot cards. I got a full house and 4 people died. -- Steven Wright