Including 2024 projections for specific code reuse GitHub and other sources have reported more than 50% of developers adopting AI Assisted-development during 2023. What these sources haven't reported is how the composition of code changes when AI is used. We examine 4 years worth of data, encompassing more than 150m changed lines of code, to determine how AI Assistants influence the quality of code being written. We find a significant uptick in churn code, and a concerning decrease in code reuse...