They are not flouting it yet.
There is a 3 month grace period which expires at the end of May and from 1st June it should be fully enforced. No smoking in air conditioned areas, or areas with less than 3 open sides.
Whether it will be fully enforced is yet to be seen
It wont be strictly enforced, trust your Uncle Jim, it will just be another opportunity to earn tea money, Thai police are crooks, everyone knows that.
although they have been stopping people in Pattaya for using phones whilst driving and not wearing crash helmets.
They also do that on the junction of Soi 4 Bangkok, not exactly same, same as smoking is it.