Definitely either get cigs on board the aircraft or when you land at Dalaman.
I'm pretty sure there is a restriction on the amount of ciggies you can take into Turkey and it's something like 600.
And yes, no matter what they tell you in the duty free shops when you're leaving
Dalaman the limit is 200 to bring back to the UK
Last time I passed through Dalaman a chap was telling everyone his girlfriend worked at Mancheter airport and the amount you could take into the UK had officially been increased to 1,000 - absolutely not the case!
I usually buy spirits at the UK airport - there are normally good deals to be had, depending what your tipple is.
Perfumes - probably a bigger choice at your UK airport, and again, quite often some good deals.
Gold jewellery - wait until you get to Icmeler. I can recommend the Sultan Jewellers, situated under the Prince Apartments in the centre of resort.
So jealous you're going in just hours... of course we will all be expecting a full report on your holiday.
Have a fabulous time - and if you need someone to carry your bags I'm available (it'll just cost you the price of an airline ticket!!

)
Mazz