Jill and Joanie Shockley just want to breathe clean air in their homes. Neighbouring tenants want to smoke in theirs. The Shockleys, sisters who live in a suburb of St Paul, Minnesota, where tobacco smoke from other units wafts daily into their homes complain intermittently.”It’s frustrating,” said Joanie Shockley, 59. “I like to have my grandchildren come over, and I don’t like for them to be exposed to people smoking.”The Shockleys are part of a growing movement to restrict smoking in apartments and condominiums that is having some success. This year, two California cities passed laws restricting smoking inside multiunit residential buildings. In the last 14 months, two large residential real estate companies in several states banned smoking inside units.Thousands of smaller apartment complexes across the country have taken similar steps, said Jim Bergman, founder of the Smoke-Free Environments Law project, which is based in Michigan. And about 60 public housing authorities across the country have smoke-free policies, compared with less than 10 three years ago, Bergman said.Health advocacy groups call housing one of the smoke-free movement’s final frontiers. Owners of apartment buildings are beginning to recognize the demand for smoke-free housing, said Bergman, one of the organizers of a meeting of about 75 smoke-free housing advocates from around the country held in Minneapolis.Edward Sweda Jr, senior lawyer at the Tobacco Control Resource Center of the Northeastern University School of Law in Boston, says he has studied the legal issues of secondhand smoke for 28 years and knows of no law in the United States prohibiting residential property owners from banning smoking.