There is a big difference between dependency on food and dependency on beer for example. Need vs. Want. I don't need beer to survive, I do need water. Beer I will use to lighten up, enjoy - water to satisfy thirst and keep the body working. Drugs fall in mind made wants. Taking drugs to set yourself free of bonds and compulsions that kill your being, joy, clarity - that's illogical - you are trading one dependency for other.