Café Ministerium

Because I had to kill some time before going to see a movie at the Urania, I decided to take a drink there. When I entered, two tables were occupied. No ashtrays were on any table, but a man smoked at the counter. So I thought it was the no smoking section. I ordered a hot chocolate without cream and sat down to read my book. The other guests left and the waitress started to clear the tables, putting ashtrays on every table but mine (I don't smoke). 3 new guests entered and sat 3 tables away from me. One of them started smoking. I wondered why this place didn't have ashtrays on the tables when I came, but then suddenly ashtrays were put on every table although the waitress told the new guests that they would be closing in 30 min. Additional information: there seems to be another room in the back (where you go to the toilets). I couldn't find out, if this was the "real" non-smoking section, though.