Actually, they aren't just mentally addictive, your body can become physically dependent on them as well, basically your body forgets how to move your bowels without them and you hit a point where you have to have them in order to have a BM.
When you suddenly stop taking them after prolonged use, you won't have a BM for a long time, and when you finally do, it will be hard as a rock and very hard to go.
OOps, sorry, Dave pretty well covered that, just not in my exact words, I didn't read his whole post.
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