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 ubiq

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, https://www.sciencedirect.com/science/article/pii/0273230087900493 https://www.sciencedirect.com/science/article/pii/0273230087... Also see carcinization: https://en.wikipedia.org/wiki/Carcinisation https://en.wikipedia.org/wiki/Carcinisation