Habitual activity--smoking, eating fatty foods, gambling--changes neural activity patterns in a specific region of the brain when habits are formed. These neural patterns created by habit can be changed or altered. But when a stimulus from the old days returns, the dormant pattern can reassert itself, according to a new study from the Massachusetts Institute of Technology, putting an individual in a neural state akin to being on autopilot.
I think this is what Aristotle was talking about, "The unexamined life is not worth living." It is far to easy to fall into a pattern of habits and not do anything that is needful.
It takes work to move out of our comfort zone, and it is mainly by rewiring our brain.
The hardest thing to break a habit is to stay away from the old triggers that start our habit response.