I won't agree with that "very quickly", from my own experience, but you are generally right. Every drug has withdrawals, some only mental, some both mental and physical. Pot for instance, has no confirmed physical withdrawals and is mildly mentally addictive (closer to not really). Heroin on the...
1. Baldur's Gate I&II - best RPG ever created, with unmatched story and gameplay. I'm playing this at least twice a year.
2. KoTOR - magnificent piece of game and one of the best plot twists.
3. Diablo - lost most of my early teenage years over this, and do not regret a single second of it...