Software quality is about habits. The quality of our releases depends on the quality of our habits. Nobody ships a defect-riddled release because they didn't want quality. They ship it probably because the small daily behaviors that would have prevented it — the small habits — quietly stopped happening. One skipped test, one PR approved without being read, one “we'll fix it later” at a time.This article makes a quick introduction to those habits, small and large. It explains how small habits become large over time and how good and bad habits compound. I also discuss a specific danger I think we're underestimating: that AI, used without understanding and judgment, doesn't just fail to build good-quality habits. It can actively erode the ones that we may already have.