Great nuggets of information:
- Habits consist of a: cue, routine, reward
- Habits are encoded in the brain in the basal ganglia
- Habits are rewritten by figuring out a new cue/reward to replace an old one. Punishment does nothing to erase a habit.

Later in the book, it slid into tangential topics like addiction and the organization habits of companies. Would have liked it better if Duhigg spent more time on case studies of ways that different people successfully retrained bad habits in themselves. Or perhaps present an approach toward building more awareness of our habits and a greater reserve of the self-control needed to reprogram one's habits.