You feel it in the half second before you type, when your hand drifts to the chat box before your own mind has bothered to try. That reflex is the whole story. AI does not automatically make you a worse thinker, but handing it the hard part, the reasoning, the first draft, the working out, quietly runs up a debt. The effort you skip was never the price of the answer. It was the thing building you. Here is what the research really found, and how to use these tools without goin