The Austrian capital Vienna is famous for its coffee houses and cafés but infamous for the cigarette smoke which pervades them.
A few years ago new anti-smoking laws forced them to provide separate smoking and non-smoking zones but a recent court ruling means thousands of them will have to knock down walls and open up new entrances.
The café owners are threatening to sue the government for damages.
Central European correspondent Kerry Skyring is in Vienna and spoke a short while ago with Zara Zaher.
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