Then why does it make people so forgetful? These studies should always be taken with a grain of salt on both sides
It makes your short term memory worse, demonstratively, but doesn't seem to have the same affect on long term memory. And yeah, this study is on mice, so it's pretty inconclusive.
Yes, it's on mice. But I've yet to see any studies that demonstrate memory loss conclusively in humans. If you know of any, I'd love to read!