We arrived at Bangkok airport yesterday for the start of a 3 month stay. My wife smokes Benson and Hedges cigarettes which are not readily available in Thailand. We decided to take a risk and purchased 6 packs at Heathrow duty free between us on the assumption that we would pay the extra tax on arrival. Unfortunately at Bangkok the only option is to throw away aanything over the limit of one pack each so having paid about £150 for duty free we thought let's just take the risk and go through the green exit. Once into the main airport we were approached by customs and excise and taken to the office. We were fined a total of approximately £575!!!! And that all cigarettes were seized. Its certainly a deterrent and given the average local income is completely out of proportion to the crime. You have been warned!