Left BKK 2 day's ago and you could still smoke inside all the bars/gogo's in Nana plaza,
One point, a taxi driver stopped me whilst walking passed Paragon smoking a cigarette and said you cannot walk and smoke you have to stop or i would be fined 2000, i checked with the tourist information and they confirmed this but i don't think all police are inforcing it as they saw me several times around Suk
Smoking in public is no problem. But you will be fined for littering, when you throwing your cigarette on the street.