If you’re in NSW, then as far as I’m aware there is no model by-law to prohibit smoking within strata-titled buildings, only sporadic prognostications by the Minister/s and his Department that have to date gone down the same path as the reforms to strata law; nowhere!
That’s not to say that your Owners Corporation could not itself resolve to create such a Special By-Law in a form that’s suitable for its Strata Plan, although enforcing that (for the want of a better term) would be an interesting exercise.
You may find some useful information HERE.