AirBnb is terrible. There is no way to enforce any fines for smoking. They will not reimburse a host for anything but physical damage. A guest smoked like a chimney and did a ton of drugs. They left the place in terrible shape, and they, AirBnb, do nothing. I have since blocked all my dates that are available from AirBnb and listed my place on a different site.
There is No, Zero recourse for hosts with unruly, discourteous, abusive and offensive guests.
AirBnb only cares about those from whom they make their money - the guests.