Some city landlords have begun prohibiting tenants from smoking inside their apartments, because of the dangers of second-hand smoke. A study recently found that secondhand smoke causes at least 35,000 deaths from heart disease and 3,000 deaths from lung cancer in nonsmokers nationwide each year—and New Yorkers are even more at risk because their dense urban environment. As one tobacco expert put it: "Smoke doesn’t know to stop at a doorway. It fills the full capacity of every indoor location in which the cigarette is smoked." So at least one major real estate company is now stepping in to stop the smoke before it starts.



