[antman]

Every decision you make feeds and strengthens some part of your neural network.

Using the "Thinking fast and slow analogy" book analogy these are my geeky definitions:

Fast (automatic, unconscious) thinking is always a vote towards what you are and slow thinking is 50% vote for what you are and 50% on what you are becoming. What you are becoming is a combination of what you want and what your environment pushes you to. Abuse or hedonism makes you working towards places where you better not be. Forming a habit is moving an action from slow thinking mode to fast thinking mode.