These cities have differing policies on public smoking. The study also included two cities with no such restrictions.

这些城市对公共场合抽烟有不同的政策，这些研究也包括不进行抽烟限制的两个城市。

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These included cutting down on smoking or drinking alcohol, adopting different sleeping positions, and using dental gum shields which help hold muscles in place and so prevent snoring.

BBC: NEWS | Health | Women 'too meek' over men snoring