Once you start taking things like neuro ps to help mental function, do you develop a dependence?

maybe "dependence" isn't the right word. you know how you can get endorphins flowing from drugs, etc. and once you get a rush of them, it is hard to achieve the same feeling with the same amount later (like decensatization -sp?) so does the same things happen for mental performance supplements like b-12, neurops, ginkgo biloba, ginseng, etc.??? lots of people say they notice a difference when they stop taking these things, but does that mean that they really helped them or they just are having a hard time without them because their brain got used to them?