We increasingly let machines think for us, not just in everyday choices, but in how we navigate reality itself. Cognitive offloading describes this process of delegating mental tasks to external systems. What begins as a tool for convenience can quietly erode our ability to notice, remember, and decide for ourselves. As artificial intelligence mediates how we access information, make decisions, and even perceive the world, this quiet handover of our cognitive autonomy is not only convenient, but becoming dangerous. This article explores how cognitive offloading undermines our ability to think critically, and why that erosion poses a structural threat to our democracies.