Yes, the smoking room is now closed. My Partner smokes, to do this she had to go through arrivals and back into the terminal for a smoke!
The person on the arrivals/passport desk didn't really 'get it' and was quite rude. Saying that there wasn't time to have a smoke, etc, and get back through security for the flight.
However, all was fine as the security fastrack was open. I gather that it's sometimes closed, so watch out for that.
The friendly lounge dragon knew of a short cut, so may be best asking first.
Hope this helps.
I can't help thinking it's easier not to smoke