Danny..
Unfortunately the majority of Indonesians are heavy smokers (Garuda Pilots included).Indonesian DGAC (equivalent CAO's) states in a nutshell that smoking on the flight deck is permissable so long as certain activities such as refuelling are not being carried out...Garuda's SOP states that the PIC determines whether or not the flightdeck is a non smoking one or a smoking one (so if you were a non smoking F/O you would have to put up with it!! ).....i think a previous poster alluded to the fact that PIC=GOD in SE Asia.
I reckon you should write to them and explain that GOD's second hand smoke eventually gets to the C class cabin...
HD.