I think thumb-sucking is probably one of those unconscious habits people form, and sometimes don't break. I've known a few people who sucked a thumb or finger when they were stressed or concentrating hard. Most people grow out of it, and move on to other things, like chewing their nails, or (like me), twisting your hair.
(Yes, I twist my hair. All the time. Unconsciously, too. And it's worse when I'm stressed, but more often when I'm deep inside my own head...I also slept with a stuffed animal until I was 25. But I gave it up, and now sleep with an extra pillow. No different, just a more "acceptable" thing)
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Lover, Bard, Phone Monkey, and MILF!
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