It's been covered somewhere else but the ban on inflight smoking applies only to flights that have some Australian connection (
e.g., airline is Australian, the aircraft is registered in Australia, and/or carrying passengers solely wthin Australian destinations.) Airlines with no Australian connection are not required to ban inflight smoking.
http://www.dotrs.gov.au/aviation/smoking.htm
[This message has been edited by terenz (edited 05-25-2001).]