Yes, it is smoke free on OZ and NZ sailings. But on the repositioning cruise, once we leave NZ waters, I'm pretty sure smoking will be allowed again.
The Retreat isn't noisy, it's a relaxing area. It's a popular place during sunny days, but you will usually find empty loungers.
Royal Princess Retreat two months ago in SYD:
If you didn't find it yet, this is our roll call thread: