just like smartphone, it depends on how you use it because AI is just another tool

if you use it to save time and learn faster, you will become better and better, just leveraging on technology

if you use it to save time and do your work instead of learning that causes less cognitive activity and stimulation, you will loose your brain processing and become less intelligent. same goes to memory as well

to give you a real life example, how often do you remember important phone numbers or use your instinct to navigate around a new place? if you are doing this lesser and lesser, your gifted brain and memory will erode as time pass by