US and Canada have seen great decreases after big anti smoking campaigns in the 90s and laws in the 2000s. Apparently European countries have not. But I have no idea about Australia and New Zealand.
The rates have gone down and lots of people have moved to vaping as others have mentioned.
My take is that while it's prohibited in many areas the enforcement is shocking.
I attend a hospital outpatient clinic at least 6 visits per year (usually more for scans and stuff). It's prohibited on the hospital campus and has been for ages. Signs everywhere.
Don't think I've ever been in the last 10 years and not seen someone smoking.
Similar enforcement in city malls and other areas where it's prohibited. People only care if it's inside