>>How about erasing cigarettes from historic photographs? The one from Yalta appeared in our daughter's history textbook without it. I've even seen album covers where the picture on the reissue is censored.
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I can't remember who wrote it, when, or what the story was really all about but............

I do remember reading a science fiction story where the job of one of the main characters was to remove all images of smoking from old movies and/or TV shows.