This is interesting. Taken from an article at The Telegraph


The UK will soon be experiencing similar; the Merchant Shipping Act is being amended to enforce a smoking ban on ships entering UK waters.

The Act is expected to come into play at the start of 2008 and will probably be policed by the Maritime and Coastguard Agency (although it's hard to see how). Crucially, it will mean that smoking will be banned in public areas on all ships within 12 miles of a UK arrival or departure point. Whether that includes cabins or not remains to be seen.