Well, the “experts” say a charred steak is carcinogenic. At that point, I stopped listening to anything out of their mouths. It might be true, but it’s also a matter of degree.

California has set such a low threshold that one cannot take their label seriously about anything. It applies to nearly everything, making it effectively a useless warning.

  In the seventies, the view was often expressed to me by lay audiences that there was no point in stopping smoking, since everything was a carcinogen and so ubiquitous as to be unavoidable. This view was certainly pushed by the tobacco companies with the bizarre support of many environmentalists,

Also see carcinization: https://en.wikipedia.org/wiki/Carcinisation

It also never lists the specific substances nor what one can do about it (not enter the building, don’t lick the ceiling, wear a mask, whatever). Good intentioned but utterly useless.