|According to Wikipedia, "Big Tobacco is a pejorative term often applied to the tobacco industry in general, or more particularly to the "big three" tobacco corporations in the United States and the United Kingdom. The phrase is often used in [...] anti-smoking ad campaigns..."
This is a tag for posts about Big Media, which is a similarly pejorative epithet that, unlike Big Tobacco, which refers to the big tobacco companies (e.g. RJR, Philip Morris), refers to all of the big players in the major international media cartels. And by "big players", of course, I mean to expand the scope of the term to include not only privately held corporations, but the trade guilds that protect the interests of the executive management of those corporations (e.g. the RIAA, the MPAA).