Also in NZ. The current house (1959) has a range hood vented to the outside, but I can see from marks on the outside wall that it previously had a simple extractor fan (vents outside but no hood to collect the smells/steam from over the stove top). Our previous house (1922) had an extractor straight into the roof cavity, needless to say that was replaced along with removing half a ton of congealed fat that had collect there over the decades. In apartments I have seen the recirculation type fans quite often. You need to clean and/or replace the charcoal filters on a regular basis or all they push bad air around. As for cooking here, while we (wife and I) love a gas hob, they are becoming much rarer. Both mains and bottled gas are being phased out as being environmentally damaging. We still have gas for a BBQ, but much prefer a charcoal one dur to its inherent smokiness.