hi,
i buy 1000 benson's at gatwick and put in a ruck sack, then buy 400 on arrival at dalaman, then buy another 1000 at dalaman to come home with ... so in all i come home with 2200 ... duty free only allows you to bring in 200 as it's not in the EU. if your going to get caught then it might as well be for a load rather than just 400 !!
at gatwich they are £85
at dalaman £75 - 80
on thomas cook flight 400 for £34
I was once told not to buy cigs out in turkey as they could be fake unless you buy them from a cig shop, buy yours at the airports like me,
also turkish law is that they only allow you to take in 400. so its up to you and 200 out ? but i have never been checked
where are you flying from ?