I believe there may be still a limited quota allowed or they would have closed those duty-free shops.
The selling of ciggies for inbound passengers has been abolished for a long time liao. Those duty free shops are opened for you to buy yr liquor, beers and stouts, if u want to.
Come Jan 09, all ciggies without the SDPC mark would be deemd as duty un-paid items and hence illegal for consumption here. If u still have any duty free cigges which were procured when u left the airport upon yr return, failure to declare them will also land u in trouble. Hope this helps. Cheers.