This is like taking something that prevents you from absorbing alcohol in your body. Which has similar addictive properties. Hard stuff really is very very hard to do cold turkey on like you can with alcohol.
Actually, that happens with heavy enough drinking, too, though yeah, the point is still sound, it's never even remotely as extreme. Also I think it takes years upon years of drinking to build up the good tolerance load.
Getting hooked on heroin does have the side effect that it's one of the less harmful "hard" drugs short-term; If it doesn't kill you by either overdose(Which is far too easy) or by having something laced in it, it's long-term effects are pretty minor compared to, say, methadrine or cocaine. (I...seem to recall finding that it wasn't worse than alcohol when I skimmed the info on it, in fact.
I have this strange fascination with drugs, the same one I do with pesticides. Weird chemicals are kinda cool, even if I don't want to eat them. But I digress.)
Still, man, try
hard to get off that. Yeah, short term, it's not going to ruin your life(Directly. The money it *costs* is quite another matter.), but it's pretty much an inevitable cutting short of your life; It's too damned psychologically easy to have a bad day and want to take more. Then have a few more bad days and suddenly you're hooked on a higher level. Then this happens a few more times and you die. It's dangerous as hell, and I hope the best for you managing to shake the bastard, though god knows it's hard as hell.
(Such a weird drug.)
Anyways, as for myself...
Over the counter:
Used to be hooked on antihistamines. Stopped when I realized they were having mixed results. Probably never taking them again after learning they substantially disimprove infections in the sinuses. SO AWESOME.
Otherwise, I've taken pain pills back when I had a toothache, but I don't really run towards popping an Advil or anything for pain, just not worth the bother. (Possibly because of that toothache. Meeeeeh muscle aches tends to be the reaction now. That was one hell of a toothache.)
Recreational:
Yeah, caffiene, I tend to take in about 40-60% of a pot of coffee a day. I have a god-awful slow metabolism, so this tends to have the effect I've seen on normal people of about two cups. ^_^
Otherwise, that's about it for moi.