Binaural beats seem to be anti-addictive. I've found that the more I used certain doses, the less I felt I needed them. My theory is that as your brain merely syncs it's brainwave state to the binaural beat, you only get the effects of the brainwave state, as your brain releases chemicals based on the state it's in. The only thing you can get addicted to is the naturally produced chemicals from your brain, and your brain can keep providing it, so you don't have to look outside for that effect anymore. I think that's how certain people were able to break addictions from real drugs because now their brain gives them the effect and they don't need the real thing anymore.
It's just like how we get addicted to stress, anger, drama, happiness etc. It's brainwave state addiction.