Originally posted by Graeblyn
Since this error of mine was posted here, I have been monitoring what I say, and I always SAY "an historic" to the point where I can't even MAKE myself say "a historic" unless I put a big pause between the two words.
(I don't think it's an error.)

Habits are like that. There's a lot of words that I consciously started pronouncing in a way different from that in which my family pronounces it, and now I automatically say it in the way I have started to. (Mostly the changes have been to improve clarity of speech, which means that my speaking style is now a bit more clipped, you might say upper-class, than my family's. I'll pronounce the 't' in 'often', although that's more influenced by Pirates of Penzance than anything else.) It's possible to change habits; you have to do so very deliberately, and could slip back into the old way, but once the habit has been "rewritten" in your mind, it takes conscious effort to revert.