If you find your neighbor “terrifying,” however, you might be willing to wait out the lease, like these housemates were. After all, according to the CDC, “There is no safe level of exposure to secondhand smoke.” And the World Health Organization’s statistics support this, stating that each year, exposure to secondhand smoke is fatal for over 1.6 million people. So, short of fighting fire with fire—or ice, in this case—what can you do about a neighbor’s secondhand smoke? And in some circumstances, persistent secondhand smoke may even raise questions about a property’s “warranty of habitability”—the landlord’s legal obligation to provide safe and livable housing.