Habits are a double edged sword. If you know how to have the right side of the blade working for you, then they can be really powerful. But if you sort of stumble into them, then you often find yourself in a place that you were hoping you werent. I like to divide a habit into four stages - cue, craving, response and reward. And i think if you understand them,. then you understand how a habit works, but you also understand where to intervene. It's actionable. The more firmly the behaviour gets established, the more imbedded it becomes.