'Half smokers' in Wales offered illegal tobacco - Ash
Almost half of smokers in Wales have been offered illegal tobacco to buy and 15% of all tobacco sold here is illegal, according to new research.
It is the first time the anti-smoking campaign group Ash has looked into the issue in Wales.
The study also suggests Wales has a larger market in illegal tobacco than any region in England.
BBC Wales health correspondent Owain Clarke joined the teams - and their dogs - sniffing out the illegal trade in Cardiff.