Absentee landlord rents to smokers. Secondhand smoke issue. HOA nuisance bylaw however won't intervene. Tenants tell realtor they don't smoke. untrue

Sent several emails to realtor. Purchased air monitor with proof of VOC increases and obvious smell of smoke. Claims smoke must be coming from someplace else because tenant told her they don't smoke in house since being told. Nonsense. Going to test attic for second hand smoke. Tired of breathing secondhand smoke. No reply from realtor after sending proof. Recourse?