Choux flat,
In NSW you are lucky enough to actually be able to take your own action through Fair Trading to have the by-laws enforced.
Ultimately you do not want an owners corporation having to enforce all perceived by-law issues all of the time (especially in a large building), otherwise you will be engaging someone on a full time basis to police the building etc… (yes a bit extreme but where do you draw the line).
Owners that have an issue with their noisy, smoking neighbour that is only impacting on them, should get out there and take steps to deal with this, take ownership for the problem affecting you.