I find both of these comments confusing. There is a lot of talk about GHB/GBL addiction/withdrawals but not very much as far as facts go. I personally am a heavy GHB/GBL user, going through 10oz of strong stuff (Only about 1.5 eye droppers/dose) a month between me and my gf, who uses a little less than I do. i have done it every night for a month straight as well as a period where I was dosing from the moment I woke up and have never noticed a significant tolerance build-up, have never felt addicted to it (like, "I NEED it!"), and have never experienced withdrawals when I choose not to dose for one day a week, or for a week break after each 10oz, etc.
Is GHb/GBL addiction something that occurs in some people but not others? Seems like that, or some people, instead of actually experiencing it, are very suggestible and the addiction/W/Ds are more a psychosomatic illness than anything else.