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[birdwatcher]

Smoke-free cafe in an unregulated European city: highly welcomed and economically successful.

Objective: In a unique setting with two identical cafes, which only differed in their smoking ordinances, this study assessed the influence of smoking policies on the choice of the cafe, investigated regulatory preferences among customers, and evaluated the claim that smoking cafes have better sales performance in a city without smoking bans.

Results: [...] Whereas sales showed no differences, tips were 22% (p < 0.001) higher in the non-smoking cafe.

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[keethraxx.livejournal.com]

Кстати, судя по риторике, статья писалась явно как аргумент в пользу запрета. The Zurich Lung Association funded the project.
Расположены рядом на одной улице -- там floor plan нарисован.

In the centre of the city of Basel, the second largest city in
Switzerland, an innovative hospitality business was initiated a
few years ago. Among other activities, the “Unternehmen
Mitte” runs two identical cafes which only differ in their
smoking policies...