No, I'm not a smoker, but some friends coming on a trip with me are, and they want to know what their options are (I suppose some of the 12+ hour journeys we have planned frighten them).

Personally, I hope it's banned everywhere, but you never know.

Let's limit it to the EU and the EEA. We can assume that most places prohibit smoking on the train, so let's hear if there are any exceptions, and which countries forbid smoking in the station (the UK is one, I believe).