Last year, for the first time, a large majority of my students used chatGPT.

This correlated with their skills at the start of the year: the more they lacked (or were lazy), the more they used it. And at the end of the year, they were the ones who had learned the least.

I'm not playing the old fart who thinks young people are getting dumber and dumber. There are beginning to be studies on this, and my little experience is consistent with their results.