This thread is pretty old but I thought I'd share my recent experiences in Europe and how I tend to vape indoors in bars and airports in those places...
Spain (where I live): Pretty much accepted anywhere.
Bars: Publicly
Airports: Publicly
UK: Tolerated but become increasingly prohibited in some bar chains...etc
Bars: Discreet / sometimes stealth
Airports: Very discreet / stealth
Switzerland: Tolerated, can use but not buy nic containing juice
Bars: Publicly / Discreet depending on the bar
Airports: Very discreet / stealth
Belgium: Legal but same status as tobacco
Bars: No, they can get a fine, so can you
Airports: No
Czech Republic: Widely accepted
Bars: Publicly
Airports: Discreet
* When I say "publicly" I don't mean cloud chasing in a crowded bar - I mean I don't mind if other customers or staff are fully aware that I'm
vaping, I always respect others around me and always adjust my
vaping style to suit my surroundings - common curtesy!